2008-12-12_100040GSM Mobile/Cellular Phones
All our GSM Cellular Phones are GSM 900 and GSM 1800 network compatible. GSM is a digital network used in Europe, Asia and Africa. All our GSM Cellular Phones are unlocked and use SIM Card. SIM Cards for international roaming can be purchased from Bell South, A T & T, GTE and Voice Stream. Better yet, they are available at much cheaper rate in the country of your traveling. All GSM Cellular Phones we sell are unlocked and equipped with 220/240 volt charger adapter.

GSM Mobile/Cellular Phones2008-12-12_100130
GSM 900 or just GSM – Global system of mobile communications, is the world’s most widely used digital network and now operating in over 100 countries around the world, particularly in Europe and Asia Pacific. The GSM system also includes GSM 1800 and GSM 1900 and GSM Phones are either phase 1 or phase 2 compliant. GSM 1800(DCS1800 or PCN) is a digital network used in some parts of Europe, Asia-Pacific and Australia.

2008-12-12_100234GSM 1900(PCS1900) is a digital networking used in the U.S.A., Canada and some parts of Latin America and Africa. Most GSM cellular phones use SIM card – subscriber identity module Card – a small printed circuit board that must be inserted in any GSM based mobile phone when signing on as a subscriber. SIMCARD contains subscriber details, security information and memory for a personal directory of numbers. The 2008-12-12_101052card can be a small plug-in type or sized as a credit card but has the same functionality. All our Ericsson and other GSM cellular phones are GSM 900 or GSM 1800 with 220/240 Volt battery charger (AC Adapter) for exclusively use overseas. Please note that some mobile phone features are ‘Network Supported’. This means that although the phone has this specific feature it must be provided in your local network, in order to work.2008-12-12_100448

  • GSM Mobile Phones must be returrned in 14 days for exchange only. No refunds on GSM mobile phones.Note: Some GSM cellular phones may or may not contain instruction books in English or any particular language. You may download manuals from respective manufacturer’s websites.
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1.5-Way Paging

Refers to guaranteed message receipt or advanced messaging, ensuring subscribers receive messages sent when they’re out of range, but users cannot send text pages. Two-way paging allows users to send and receive.

1.7-Way Paging

A paging service that offers more than guaranteed messaging but not as much as full two-way paging. The subscriber has limited response messaging, such as canned messages, rather than the ability to create responses.


First generation of mobile wireless that utilizes analog air interface technology.


Interim step building up to 3G involving overlay of higher-capacity data transmission capability to existing 2G digital wireless networks.


Second generation of mobile wireless, which utilizes various digital protocols, including GSM, CDMA, TDMA, iDEN, and PDC.


The nationwide number to reach the telecommunications relay service (TRS). TRS enables telephone conversations between people with speech or hearing disabilities and people without speech or hearing disabilities.


IEEE standards for wireless LANs with specs for 1mbps, 2mbps, 11mbps, and 24mbps.


A and B PCS Blocks

The first two PCS licenses that were auctioned by the FCC in March 1995. Each contains 30 MHz of spectrum in the 1900 MHz band and is based on MTA geographic partitions.

A Block

In early 1981, the FCC announced that it would approve two licenses in each wireless market: a non-wireline company (which became known as the “A” side carrier), and a wireline company (the “B” side carrier).


A secret number issued to a cellular phone that is used in conjunction with a subscriber’s shared secret data information for authentication.

A/B Switch

A feature found on cellular telephones permitting the user (when roaming away from home) to select either the “A” (non-wireline) carrier or the “B” (wireline) carrier.

Access Fee

A special fee that local telephone companies are allowed to charge all telephone customers for the right to connect with the local phone network. Cellular subscribers pay this fee along with a 3 percent federal telephone excise tax.

Access Line

A telephone line reaching from the telephone company central office to a point on a private premise. Usually equates to one customer line.

Adjacent Channel Interference

Signal impairment to one frequency due to presence of another signal on a nearby frequency.

Advanced Intelligent Network (AIN)

A system that allows a wireless user to make and receive phone calls while roaming in areas outside the user’s “home” network. AINs enable service providers to define, test and introduce new multimedia messaging, PCS and cell routing.

Advanced Mobile Phone Service (AMPS)

An analog cellular radio standard that serves as the foundation for the U.S. cellular industry. AMPS represents the first generation of wireless networks.


Companies that assist carriers with building a wireless network. The affiliate may use the primary carrier’s brand name, network operations, customer service or other facilities.

Air Interface

The standard operating system of a wireless network. Technologies include AMPS, TDMA, CDMA and GSM.


Actual time spent talking on the cellular telephone. Most carriers bill customers based on how many minutes of airtime they use each month. Airtime charges during peak periods of the day vary from about 20 cents to more than 40 cents per minute, depending on the service plan selected. Most carriers offer reduced rates for off-peak usage.


A message or other type of readout containing both letters (“alphas”) and numbers (“numerics”). In cellular, “alphanumeric memory dial” is a special type of dial-from-memory option that displays both the name of the individual and that individual’s phone number on the cellular phone handset. The name also can be recalled by using the letters on the phone keypad. By contrast, standard memory dial recalls numbers from number-only locations.

American Mobile Telecommunications Association (AMTA)

A Washington, D.C.-based trade group representing specialized mobile radio operators.

American National Standards Institute (ANSI)

A private, non-profit organization that oversees the U.S. voluntary standardization and conformity assessment system. The Institute’s mission is to enhance both the global competitiveness of U.S. business and the U.S. quality of life by promoting and facilitating voluntary consensus standards and conformity assessment systems, and safeguarding their integrity.


A signaling method that uses continuous changes in the amplitude or frequency of a radio transmission to convey information. It relies on a continuous (rather than pulsed as in digital) electrical signal that varies in amplitude or frequency in response to changes of sound, light, position, etc., impressed on a transducer in the sending device; opposite of digital.


A wire or set of wires used to send and receive radio waves.

Application-Specific Integrated Circuit (ASIC)

An integrated circuit tailored for a particular piece of electronic equipment.

Association of Public-Safety Communications Officials-International (APCO)

Trade group headquartered in South Daytona, Fla., representing law enforcement, fire, emergency services and other public-safety agency dispatchers and communications employees.


The loss of signal energy due to absorption, reflection, or diffusion during transmission.


The verification process to assure that a wireless device and its user are compatible with and authorized to access a wireless network. This process is accomplished through transmission of identifying data at the time of connection. Used for fraud prevention.

Automatic Vehicle Location (AVL)

Combining a location-sensing device (such as a GPS receiver) with a wireless communications link to provide a home office or dispatcher with the location of a vehicle or mobile asset (such as a trailer or heavy machinery).

Average Revenue Per Unit (ARPU)

Measures the average monthly revenue generated for each customer unit, such as a cellular phone or pager, that a carrier has in operation.


B Block

In early 1981, the FCC announced that it would approve two licenses in each market- a non-wireline company (which became known as the “A” side carrier), and a wireline company (the “B” side carrier).

B Carrier

Most areas of the US have two cellular carriers, each of which operates on a different frequency band. One is designated the “A” carrier and the other is designated the “B” carrier. In some markets there may be only one carrier which may be “A” or “B”.


The capacity of a telecom line to carry signals. A greater bandwidth indicates the ability to transmit a greater amount of data over a given period of time.

Base Station

The central radio transmitter/receiver that maintains communications with mobile radiotelephone sets within a given range (typically a cell site).

Base Station Controller (BSC)

The part of the wireless system’s infrastructure that controls one or multiple cell sites’ radio signals, thus reducing the load on the switch. Performs radio signal management functions for base transceiver stations, managing functions such as frequency assignment and handoff.

Base Transceiver Station (BTS)

The name for the antenna and radio equipment necessary to provide wireless service in an area. Also called a base station or cell site.

Basic Trading Area (BTA)

A geographic region defined by a group of counties that surround a city, which is the area’s basic trading center. The boundaries of each BTA were formulated by Rand McNally & Co. and are used by the FCC determine service areas for PCS wireless licenses. The entire US and some of its territories is divided into 493 non-overlapping BTAs.

Bent Pipe Technology

Satellite technology to transmit calls from one point on Earth to a satellite and back down to another point.


Low-earth orbit satellite systems that will offer voice and data services, including Iridium and Globalstar.


Wireless personal area network (PAN) standard that enables data connections between electronic devices such as desktop computers, wireless phones, electronic organizers and printers in the 2.4 GHz range at 720kbps within a 30-foot range. Bluetooth depends on mobile devices equipped with a chip for sending and receiving information.


Describes a communications medium capable of transmitting a relatively large amount of data over a given period of time. A descriptive term for evolving digital technologies that offers integrated access to voice, high-speed data service, video-demand services, and interactive delivery services.

Broadband PCS

Personal communications services created in the A- through F-Block auctions and used for voice and data. Broadband PCS is allocated 140 MHz of spectrum with 20 MHz currently unassigned. Frequency blocks A, B, and C were each assigned 30 MHz of spectrum, while frequency blocks D, E, and F were each assigned 10 MHz of spectrum.


Grouping various telecommunications services — wireline and/or wireless — as a package to increase the appeal to potential customers and reduce advertising, marketing and other expenses associated with delivering multiple services. For example, a bundled package could include long distance, cellular, Internet and paging services.

C Block

The third PCS license that was auctioned by the FCC in May 1996. Each contains 30 MHz of spectrum in the 1900 MHz band and is based on BTA geographic partitions. The licenses were reserved for small businesses and entrepreneurs.

Call Barring

Enables you to restrict or bar certain or all types of calls to and from your mobile phone, i.e. outgoing calls, outgoing international calls, incoming calls. Barring is activated with a personal code.

Call Divert

Enables you to divert incoming calls to another phone or answering service.

Call Hold

Enables you to put a caller on hold while a second call is answered or made.

Call Restriction

Enables you to restrict or bar certain or all types of calls to and from your mobile phone, i.e. outgoing calls, outgoing international calls, incoming calls.

Call Transfer

Enables you to transfer a caller to another number.

Call Waiting

If your line is busy, callers are asked to wait while you are alerted to their incoming call.

Caller ID

An enhanced feature that displays a caller’s phone number on the wireless handset receiving the call. Many systems are adding the caller’s name to the caller ID.

Calling Plan

A rate plan selected by subscribers when they start up cellular service, usually consisting of a base rate for system access and a per-minute rate for usage. Service plans are designed to provide the most cost-effective rates for different types and amounts of usage by the cellular subscriber.

Cap Code

A pager’s unique electronic identification number.


A 3G technology that is an evolutionary outgrowth of cdmaOne. It offers operators who have deployed a 2G cdmaOne system a seamless migration path to 3G. cdma2000 supports the 2G network aspect of all existing operators regardless of technology (cdmaOne IS-136 TDMA, or GSM). This standard is also known by its ITU name IMT-CDMA Multi-Carrier (1X/3X). cdma2000 has been divided into 2 phases. The first phase capabilities are defined in a standard known as 1X, which introduces 144 kbps packet data in a mobile environment and speeds beyond this in a fixed environment. cdma2000 phase two, known as 3X, incorporates the capabilities of 1X. It also supports all channel sizes (5 MHz, 10 MHz, etc.), provides circuit and packet data rates up to 2 Mbps, incorporates advance multimedia capabilities, and includes a framework for advanced 3G voice services and vocoders, including voice over packet and circuit data.


The name used by the CDMA Development Group (CDG) for CDMA networks (IS-95) using 2nd-generation digital technology.


The basic geographic unit of a cellular system. Also, the basis for the generic industry term: “cellular.” A city or county is divided into smaller “cells,” each of which is equipped with a low-powered radio transmitter/receiver. The cells can vary in size depending upon terrain, capacity demands, etc. By controlling the transmission power, the radio frequencies assigned to one cell can be limited to the boundaries of that cell. When a wireless phone moves from one cell toward another, a computer at the Mobile Telephone Switching Office (MTSO) monitors the movement and at the proper time, transfers or hands off the phone call to the new cell and another radio frequency. The handoff is performed so quickly that it is not noticeable to the callers.

Cell Phone

A wireless telephone that sends and receives messages using radiofrequency energy in the 800-900 megahertz portion of the radiofrequency (RF) spectrum.

Cell Site

The location where the wireless antenna and network communications equipment is placed. A cell site consists of a transmitter/receiver, antenna tower, transmission radios and radio controllers. A cell site is operated by a Wireless Service Provider (WSP).

Cell Splitting

The process of creating more coverage and capacity in a wireless system by having more than one cell site cover a particular amount of geography. Each cell site covers a smaller area, with lower power MHz and thus offers the ability to reuse frequencies more times in a larger geographic coverage area, such as a city or MTA.


A wireless telephone network that connects radio frequencies from a mobile phone to a system of multiple cell sites, each consisting of an antenna and a base station, to a mobile telephone switching office, and ultimately to the public wireline telephone system. Called ‘cellular’ because the system uses many base stations to divide a service area into multiple ‘cells’. Cellular calls are transferred from base station to base station as a user travels from cell to cell.

Cellular Base Station

The transmission and reception equipment, including the base station antenna, which connects a cellular phone to the network. Also called a cell site.

Cellular Digital Packet Data (CDPD)

An enhanced packet overlay on analog cell phone networks used to transmit and receive data. This technology allows data files to be broken into a number of packets and sent along idle channels of existing cellular voice networks. CDPD provides 19.2 Kbps and is deployed by AT&T among several other carriers.

Cellular Telecommunications and Internet Association (CTIA)

A trade group representing cellular, PCS and enhanced specialized mobile radio carriers. Customer Proprietary Network Information (CPNI): The carrier’s data about a specific customer’s service and usage. The FCC governs the usage of CPNI. Generally, information about a customer’s account is considered proprietary until the customer authorizes its use.


An electrical, electromagnetic, or optical path for communication between two points.


In any industry, a measure of the number of customers who leave or switch to another service provider, usually stated as a percentage.

Circuit Switch Data (CSD)

Allows a user to use their wireless handset as a modem for laptops, PDAs and other electronic devices via infrared ports or designated data cables. CSD also allows a user to access Wireless Internet via their wireless handset (handset must be WAP compatible).


A program of the CTIA Foundation providing wireless phones to schools for teacher use and student Internet access.


A wireless phone programmed with stolen or duplicated electronic serial and mobile identification numbers. The Wireless Telephone Protection Act of 1998 outlawed cloning. The Act prohibits knowingly using, producing, trafficking in, having control or custody of, or possessing hardware or software knowing that it has been configured to insert or modify telecommunication identifying information associated with or contained in a telecommunications instrument so that such instrument may be used to obtain telecommunications service without authorization.

Code Division Multiple Access (CDMA)

An air interface technology that was developed by the U.S. military and commercialized by the U.S. company Qualcomm. CDMA assigns a code to all speech bits, sends a scrambled transmission of the encoded speech over the air and reassembles the speech to its original form at the other end. CDMA supports SMS with a message length of 120 characters. With CDMA, each conversation is digitized and then tagged with a code. The mobile phone receives a signal to locate that particular code and it then deciphers the conversation off the airwaves. It codes each conversation expanding it 128 times, making it easy to decipher at the receiving end.


Placement of multiple antennas at a common physical site to reduce environmental impact and real estate costs and speed zoning approvals and network deployment.

Commercial Mobile Radio Service (CMRS)

An FCC designation for any carrier or licensee whose wireless network is connected to the public switched telephone network and/or is operated for profit.

Communications Assistance to Law Enforcement Act (CALEA)

A 1994 law granting law enforcement agencies the ability to wiretap new digital networks and requiring wireless and wireline carriers to enable surveillance equipment use in digital networks.

Competitive Local Exchange Carrier (CLEC)

Any telephone company that offers service in a specific area. Now that the industry has been deregulated, several companies may offer service in a single area. New ones entering a market are Competitive Local Exchange Carriers. The original telephone company at the time of deregulation is known as the Incumbent Local Exchange Carrier (See also “ILEC”).

Content Services

Paging service, beyond telephone number alerts, that include news and sports headlines, personalized stock quotes, driving directions, restaurant reviews and information contained on Internet sites.

Control Channel

A logic channel carrying network information rather than the actual voice or data messages transmitted over the network.


Refers to the region within which a paging receiver can reliably receive the transmission of the paging signals.


Interference in a wireless communications system from other conversations in nearby cells using the same channel.

Customer Acquisition Cost

The average cost to a carrier of signing up an individual subscriber. Some of the factors included in the cost are handset subsidies, marketing, advertising and promotions.


D and E PCS Blocks

The fourth and fifth PCS licenses that were auctioned by the FCC in January 1997. Each contains MHz of spectrum in the 1900 MHz band and is based on BTA geographical partitions. The licenses were reserved for smaller businesses and entrepreneurs.

Decibel (dB)

A unit of measure used to express relative difference in power or intensity of sound.


A method of encoding information using a binary code of 0s and 1s from electrical pulses. Because digital signals are made up only of binary streams, less information is needed to transmit a message. Digital encoding therefore increases the capacity of a given radio frequency. Furthermore, only digitized information can be transported through a noisy channel without degradation. Digital technology reproduces sound exactly, and can even filter out background and electronic “noise.” Even if corruption occurs, as long as the one zero patterns are recognizable, the original information content can be perfectly replicated at the receiving end. Most new wireless phones and networks use digital technology.

Digital Cellular System (DCS 1800)

A global system for mobile communications-based PCS network used outside of the U.S.

Digital Signal Processor (DSP)

A microprocessor that digitizes analog signals.


The splitting of a spectrum license into two or more licenses of fewer frequencies.


The portion of a telecommunications path from a satellite to the ground. Also referred to as the reverse link.

Drive Test

A method of taking signal strength measurements in a cellular coverage area.

Dual Band

A feature on some wireless phones that allows the handset to operate using either the 800 MHz cellular or the 1900 MHz PCS frequencies.

Dual Mode

A feature on some wireless phones that allows the handset to operate on both analog and digital networks.

Electromagnetic Energy

Waves of electrical and magnetic energy moving together through space. Also called electromagnetic radiation.

Electromagnetic Field

An area containing electromagnetic energy (electromagnetic radiation).

Electromagnetic Radiation

Waves of electrical and magnetic energy moving together through space. Also called electromagnetic energy.

Electromagnetic Spectrum

The collection of all electromagnetic energy arranged according to frequency and wavelength.

Electronic Serial Number (ESN)

The unique identification number embedded in a wireless phone by the manufacturer. Each time a call is placed, the ESN is automatically transmitted to the base station so the wireless carrier’s mobile switching office can check the call’s validity. The ESN cannot easily be altered in the field. The ESN differs from the mobile identification number, which is the wireless carrier’s identifier for a phone in the network. MINs and ESNs can be electronically checked to help prevent fraud.


The process of encoding a message such as a digital phone signal to prevent it from being read by unauthorized parties.

Enhanced 911 (E911)

911 service becomes E911 when automatic number identification and automatic location information from a wireless phone is provided to the 911 operator. Reimbursement, or cost recovery, is due to commercial providers of both recurring and nonrecurring costs associated with any services, operation, administration or maintenance of wireless E911 service. Costs include, but are not limited to, the costs of design, development, upgrades, equipment, software and other expenses associated with the implementation of wireless E911 service.

Enhanced Data for GSM Evolution (EDGE)

The final evolution of data communications within the GSM standard. Based on 8PSK modulation, EDGE provides 3G packet data throughput on GSM networks, and uses a new modulation scheme to enable data throughput speeds of up to 384kbit/s using existing GSM infrastructure.

Enhanced Specialized Mobile Radio (ESMR)

Digital SMR networks that provide dispatch, voice, and messaging and data services.

European Telecommunications Standards Institute (ETSI)

A standards-setting body in Europe. Also the standards body responsible for GSM.


F PCS Block

The final PCS license that was auctioned by the FCC in January 1997. Each contains 10 MHz of spectrum in the 1900 MHz band and is based on BTA geographic partitions. The licenses were reserved for small businesses and entrepreneurs.

Federal Communications Commission (FCC)

The federal government agency located in Washington, D.C. responsible for regulating telecommunications in the United States, including commercial and private wireless spectrum management.

Fiber Optic

Using fine, transparent lines for the transmission of data, digitally encoded into pulses of light. In terms of telephone conversations, a 1/2″ copper cable can transmit about 25 conversations analog, whereas a 1/2″ fiber optic line can transmit 193,536 conversations digitally.


Originally developed by Apple, this is an increasingly popular and very fast external bus for transferring data between devices; also known as IEEE 1394 for the name of the standard it engendered.

Flash Memory

A component used for memory that can retain information without power.

Foliage Attenuation

Reductions in signal strength or quality due to signal absorption by trees or foliage obstructions in the signal’s line-of-sight path. For example, 800 MHz systems are seldom deployed in forested areas. Pine needles — nearly the same length as 800 MHz antennas — can negatively affect signal reception in that band.

Frame Relay

Wideband, packet-based interface used to transmit bursts of data over a wide-area network. Seldom used for voice.


The number of oscillations, or vibrations, of radio waves per unit of time, usually expressed in either cycles-per-second or Hertz (Hz).

Frequency Modulation (FM)

A signaling method that varies the carrier frequency in proportion to the amplitude of the modulating signal.

Frequency Reuse

The ability to use the same frequencies repeatedly across a cellular system, made possible by the basic design approach for cellular. Since each cell is designed to use radio frequencies only within its boundaries, the same frequencies can be reused in other cells not far away with little potential for interference. The reuse of frequencies is what enables a cellular system to handle a huge number of calls with a limited number of channels.



Node that connect two different networks.

Gateway GPRS Support Node (GGSN)

Interface between the GPRS wireless data network and other networks such as the Internet or private networks.

General Packet Radio Service (GPRS)

A GSM data transmission technique that does not set up a continuous channel from a portable terminal for the transmission and reception of data, but transmits and receives data in packets. GPRS is used to boost wireless data transmission over GSM networks. GPRS can achieve 171.2 kilobits per second (kbps), which is about three times as fast as the data transmission speeds possible over today’s fixed telecommunications networks and ten times as fast as current GSM networks. Unlike existing digital wireless Net connections, no dial-up modem is necessary.

Global Positioning System (GPS)

A system of 24 satellites for identifying earth locations, launched by the U.S. By triangulation of signals from three of the satellites, a receiving unit can pinpoint its current location anywhere on earth to within a few meters. Lets those on the ground, on the water or in the air determines their position with extreme accuracy using GPS receivers.

Global System for Mobile Communications (GSM)

GSM is a digital cellular phone technology based on TDMA that is the predominant system Europe, the Middle East, Africa, Asia and in parts of America and Canada. First introduced in 1991, the GSM standard has been deployed at three different frequency bands: 900 MHz, 1800 MHz and 1900 MHz. GSM 1900 is primarily deployed in North America. Named after its frequency band around 900 MHz, GSM-900 has provided the basis for several other networks using GSM technology. GSM uses narrowband TDMA which allows eight simultaneous calls on the same radio frequency. Along with CDMA and TDMA it represents the second generation of wireless networks.


Second major LEO-based global communications system; initially created for voice, it was launched in late 1999.

GSM 1800

Also known as DCS 1800 or PCN, GSM 1800 is a digital network working on a frequency of 1800 MHz. It is used in Europe, Asia-Pacific and Australia.

GSM 1900

Also known as PCS 1900, GSM 1900 is a digital network working on a frequency of 1900 MHz. It is used in the US and Canada and is scheduled for parts of Latin America and Africa.

GSM 900

The world’s most widely used digital network and now operating in over 100 countries around the world, particularly in Europe and Asia Pacific.

GSM Hosted SMS Teleservice (GHOST)

A tunneling protocol that allows a GSM SMS to be embedded in a teleservice that can be transmitted over the air interface of a TDMA based network.


A variant of GSM, Half-Rate doubles system capacity by more efficient speech coding.

Handheld Device Markup Language (HDML)

A specialized version of HTML designed to enable wireless pagers, cell phones and other handheld devices to obtain information from Web pages. HDML was developed by Phone.com (formerly Unwired Planet) before the WAP specification was standardized. It is a subset of WAP with some features, not included in WAP. AT&T Wireless launched the first HDML-based service in 1996.


The process by which the Mobile Telephone Switching Office passes a cellular phone conversation from one radio frequency in one cell to another radio frequency in another. The handoff is performed so quickly that users usually never notice.


An important safety feature that’s included with most of today’s mobile phones. It permits drivers to use their cellular phone without lifting or holding the hand-set to their ear.

Handset Subsidy

Frequently, a wireless company will sell a phone (handset) below cost, with the hope of making up the loss later on customer usage fees. The amount of loss per handset is called the handset subsidy.

Hertz (Hz)

A unit of measurement of one cycle per second when one radio wave passes one point in one second of time. Named in honor of Heinrich Hertz, the physicist who developed the theory of radio waves.

High-Speed Circuit Switched Data (HSCSD)

The final evolution of circuit switched data within the GSM environment. HSCSD enables the transmission of data over a GSM link at speeds of up to 57.6kbit/s. This is achieved by concatenating consecutive GSM timeslots, each of, which is capable of supporting 14.4kbit/s. Up to four GSM timeslots are needed for the transmission of HSCSD.

Home Location Register (HLR)

A database residing in a local wireless network that contains service profiles and checks the identity of a local subscriber.



NTT DoCoMo’s mobile Internet access, launched in February 1999. I-mode is an alternative to WAP, though it is only implemented in Japan. It offers Internet access and email service. While WAP uses HDML, I-mode relies on Compact HTML (C-HTML). Both languages are a simple version of HTML, for use on mobile phones. Today more than 7000 sites are I-mode compatible and offer a wide range of services over mobile phones: mobile banking, ticket reservation, cartoons downloading, etc.

Incumbent Local Exchange Carrier (ILEC)

The historic local phone service provider in a market, often a former Bell company. Distinct from competitive local exchange carriers (CLECs), new market entrants.

Independent Telephone Network (ITN)

Companies not affiliated with the local telephone companies.

Industrial Telecommunications Association (ITA)

A Washington, D.C. trade group serving private wireless licensees such as airlines and oil companies.

Infrared Data Association (IrDA)

A membership organization founded in 1993 and dedicated to developing standards for wireless, infrared transmission systems between computers. With IrDA ports, a laptop or PDA can exchange data with a desktop computer or use a printer without a cable connection. Like a TV remote control, IrDA requires line-of-sight transmission. IrDA products began to appear in 1995.

Integrated Circuit Card ID (ICCID)

19 or 20-digit serial number of the SIM card.

Integrated Digital Enhanced Network (iDEN)

A wireless communications technology from Motorola that provides support for voice, data, short messages (SMS) and dispatch radio (two-way radio) in one phone. Operating in the 800MHz and 1.5GHz bands and based on TDMA, iDEN uses Motorola’s VSELP (Vector Sum Excited Linear Predictors) vocoder for voice compression and QAM modulation to deliver 64 Kbps over a 25KHz channel. Each 25KHz channel can be divided six times to transmit any mix of voice, data, dispatch or text message. Used by various carriers around the globe, Nextel Communications provides nationwide coverage in the U.S.

Intelligent Roaming Database (IRDB)

A list of acceptable and unacceptable networks for a phone to roam with stored either on a SIM card or in the phone.

Interactive Messaging

Short Message Service that allows users to send alphanumeric messages from their wireless handset to other wireless handsets or to email addresses. Interactive Messaging also allows the user to receive emails and web messages from the internet.


The connecting of one network with another, e.g. a cellular carrier’s wireless network with the local exchange.

Interim Standard (IS)

A designation of the Telecommunications Industry Association –usually followed by a number–that refers to an accepted industry protocol; e.g., IS-95, IS-136, IS-54.

International Mobile Equipment Identifier (IMEI)

A unique 15-digit number that serves as the serial number of the GSM handset. The IMEI appears on the label located on the back of the phone. The IMEI is automatically transmitted by the phone when the network asks for it. A network operator might request the IMEI to determine if a device is in disrepair, stolen or to gather statistics on fraud or faults.

International Mobile Subscriber Identifier (IMSI)

A unique 15-digit number which designates the subscriber. This number is used for provisioning in network elements.

International Mobile Telecommunications Association (IMTA)

A trade group serving specialized mobile radio and public access mobile radio carriers around the world.

International Telecommunication Union (ITU)

An agency of the United Nations, headquartered in Geneva that furthers the development of telecommunications services worldwide and oversees global allocation of spectrum for future uses.


The ability of a network to operate with other networks, such as two systems based on different protocols or technologies.

Ionizing Radiation

Very high energy electromagnetic radiation that strips electrons away from their normal locations in atoms and molecules.


First LEO-based global communications system backed by Motorola. Built primarily for voice transmissions, it was launched in 1998 and went into Chapter 11 in 1999.


The latest generation of the digital standard TDMA technology.


The network standard that allows all switches to exchange information about subscribers.


The first generation of the digital standard TDMA technology.


North American standard for 1.9 GHz wireless spread spectrum radio-frequency access technology based on a composite of CDMA and TDMA technologies To reduce infrastructure costs and allow higher data speeds than mainstream GSM or TDMA platforms.


The standard for CDMA.