Wave files can also contain data encoded with a variety of ( lossy ) codecs to reduce the file size ( for example the GSM or MP3 formats ).

In 2007 Coastel was merged with Petrocom and SOLA Communications to form Broadpoint Inc. and the network was converted to GSM.

Movistar have a 3G network with UMTS technology, and offer services over GSM in places without 3G coverage.

There are about 18 million GSM mobile phone subscribers in Afghanistan as of 2009, with over 75, 000 fixed-telephone-lines and little over 190, 000 CDMA subscribers.

It should not be confused with the mobile phone standards called cdmaOne, CDMA2000 ( the 3G evolution of cdmaOne ) and WCDMA ( the 3G standard used by GSM carriers ), which are often referred to as simply CDMA, and use CDMA as an underlying channel access method.

Through the introduction of sophisticated methods of coding and transmitting data, EDGE delivers higher bit-rates per radio channel, resulting in a threefold increase in capacity and performance compared with an ordinary GSM / GPRS connection.

Gibtelecom was also prevented from having roaming agreements with Spanish GSM networks so its mobile phones did not operate in Spain.

Gibtelecom had roaming arrangements with local GSM networks in most other countries.

Indoor coverage is also supported by GSM and may be achieved by using an indoor picocell base station, or an indoor repeater with distributed indoor antennas fed through power splitters, to deliver the radio signals from an antenna outdoors to the separate indoor distributed antenna system.

The multiple access methods used in GSM with GPRS are based on frequency division duplex ( FDD ) and TDMA.

domestic: extensive fixed-line fiber-optic network ; cellular telephone system is one of the largest in Europe with three major network operators utilizing the third generation of the Global System for Mobile Communications ( GSM ).

Nigeria's telecom regulator, Nigerian Communications Commission ( NCC ), introduced the Unified Licencing Regime with the expiration of the exclusivity period of the main GSM network providers.

Mobile communication in Slovakia became first available in the early 90's with the first NMT network operator being EuroTel Bratislava, a. s., a subsidiary of the then state owned Slovenské Telekomunikácie a. s. EuroTel introduced the first GSM service to public in 1997.

GSM mobile phone network covering all provincial capitals along with several other townships and villages and a landline system covering all provincial capitals and some townships.

In the 1980s, Televerket was a pioneering mobile network operator with the NMT system, followed in the 1990s by GSM.

BCTI was only GSM operator in country with 10-year exclusive license granted in 1994.

GSM combines TDMA with Frequency Hopping and wideband transmission to minimize common types of interference.

UMTS networks are often combined with GSM / EDGE, the latter of which is also a part of IMT-2000.

However, the migration path to UMTS is still costly: while much of the core infrastructure is shared with GSM, the cost of obtaining new spectrum licenses and overlaying UMTS at existing towers is high.

Between 2007 and 2009 all three Finnish carriers begun to use 900 MHz UMTS in a shared arrangement with its surrounding 2G GSM base stations for rural area coverage, a trend that is expected to expand over Europe in the next 1 – 3 years.

UMTS phones can use a Universal Subscriber Identity Module, USIM ( based on GSM's SIM ) and also work ( including UMTS services ) with GSM SIM cards.

In 2002, NTT DoCoMo's FOMA 3G network was the first commercial UMTS network — using a pre-release specification, it was initially incompatible with the UMTS standard at the radio level but used standard USIM cards, meaning USIM card based roaming was possible ( transferring the USIM card into a UMTS or GSM phone when travelling ).

As mentioned files can be encoded with a variety of codecs to reduce the file size ( for example the GSM or MP3 codecs ).

The PLMN was specified by the European Telecommunications Standard Institute ( ETSI ) following up with their GSM specification.

Various interfaces between the GSM subsystems are to be considered, along with the signaling system and the various components ( both hardware and software ).

Enhanced Data rates for GSM Evolution ( EDGE ) ( also known as Enhanced GPRS ( EGPRS ), or IMT Single Carrier ( IMT-SC ), or Enhanced Data rates for Global Evolution ) is a digital mobile phone technology that allows improved data transmission rates as a backward-compatible extension of GSM.

EDGE / EGPRS is implemented as a bolt-on enhancement for 2. 5G GSM / GPRS networks, making it easier for existing GSM carriers to upgrade to it.

This was expanded over time to include data communications, first by circuit switched transport, then packet data transport via GPRS ( General Packet Radio Services ) and EDGE ( Enhanced Data rates for GSM Evolution or EGPRS ).

General packet radio service ( GPRS ) is a packet oriented mobile data service on the 2G and 3G cellular communication system's global system for mobile communications ( GSM ).

GPRS is integrated into GSM Release 97 and newer releases.

The GPRS system is an integrated part of the GSM network switching subsystem.

GPRS extends the GSM Packet circuit switched data capabilities and makes the following services possible:

; Class A: Can be connected to GPRS service and GSM service ( voice, SMS ), using both at the same time.

; Class B: Can be connected to GPRS service and GSM service ( voice, SMS ), but using only one or the other at a given time.

During GSM service ( voice call or SMS ), GPRS service is suspended, and then resumed automatically after the GSM service ( voice call or SMS ) has concluded.

; Class C: Are connected to either GPRS service or GSM service ( voice, SMS ).

GSM / GPRS mobile phone services in the city are provided by Afghan Wireless, Etisalat, Roshan and MTN.

This is largely due to the introduction of GPRS ( General Packet Radio Service ) and EDGE Enhanced Data Rates for GSM Evolution connectivity by the GSM operators.

All existing GSM networks presently offer GPRS services and have introduced of 3G / UMTS.

# The UPS to report its status to the computer it powers via a communications link such as a serial port, Ethernet, GSM / GPRS or USB

To avoid the dependency on Ethernet infrastructure, the UPSs can be connected directly to main control server by using GSM / GPRS channel also.

The electricity meter communicates with a concentrator, and the latter sends the information through GPRS or GSM to the energy provider's server.

* GSM / GPRS satellite modem provider