The result was approved by the main GSM group in a June ' 85 document which was distributed to industry.

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 ).

This proposal was further elaborated in GSM subgroup WP1 Services ( Chairman Martine Alvernhe, France Telecom ) based on a contribution from Germany.

The material elaborated in GSM and its WP1 subgroup was handed over in Spring 1987 to a new GSM body called IDEG ( the Implementation of Data and Telematic Services Experts Group ), which had its kickoff in May 1987 under the chairmanship of Friedhelm Hillebrand ( German Telecom ).

In 1997 Christopher Kingdon, of Ericsson, handed in the Location Services ( LCS ) stage 1 description to the joint GSM group of the European Telecommunications Standard Institute ( ETSI ) and the American National Standards Institute ( ANSI ).

Etisalat signed an agreement to acquire 40 % of and manage Emerging Markets Telecommunications Services, Nigeria ’ s fifth GSM operator.

* Worldwide Type Approval Services for 315MHz ; 433MHz ; 2, 4GHz ; 24GHz ; 77GHz ; GSM ; UMTS ; LTE ; Wi-Fi devices ; Bluetooth devices ; Zigbee devices ; WiMAX devices ; RFID

Later, when GSM technology became available, Pacific Bell Mobile Services was re-created, debuting in 1996 at the Republican National Convention in San Diego, California and being introduced to the public in 1997.

There are so many landphone and mobile phone operator in this town. Currently Airtel, Vodafone, BSNL, Reliance ( GSM & CDMA ), MTS, Virgin, Idea, Tata Docomo, Tata Indicom, Aircel, Uninor are providing their services. Airtel provides 3G Services in this town.

* Cellular Mobile Telephone Services: BSNL is major provider of Cellular Mobile Telephone services using GSM platform under the brand name Cellone & Excel ( BSNL Mobile ).

Products: GSM Advanced Evolution ( Postpaid, 900 MHz ), GSM 1800 ( Postpaid, 1800 MHz ), One-2-Call ( Prepaid, 900 MHz ), Swasdee ( Prepaid, 900 MHz ) and Mobilelife ( Mobile Content Services )

** February 19, TT & TIM Communication Services Inc., established by the merger of Turk Telekom ’ s GSM Operator Aycell and İŞ-TİM, was officially founded.

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.

EDGE requires no hardware or software changes to be made in GSM core networks.

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.

; 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.

The first action plan of the CEPT Group GSM, approved in December 1982, requested " The services and facilities offered in the public switched telephone networks and public data networks ... should be available in the mobile system ".

Besides the completion of the main specification GSM 03. 40, the detailed protocol specifications on the system interfaces also needed to be completed.

For this reason, an entire time slot has to be dedicated to mobiles attempting to contact the network ( known as the RACH in GSM ).

Finally, if the mobile is beyond the 35 km cell range in GSM, then the RACH will arrive in a neighbouring time slot and be ignored.

In addition, almost all UMTS phones are UMTS / GSM dual-mode devices, so if a UMTS phone travels outside of UMTS coverage during a call the call may be transparently handed off to available GSM coverage.

A ( U ) SIM can be moved to another UMTS or GSM phone, and the phone will take on the user details of the ( U ) SIM, meaning it is the ( U ) SIM ( not the phone ) which determines the phone number of the phone and the billing for calls made from the phone.

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

A GSM PLMN may be described by a limited set of access interfaces and a limited set of GSM PLMN connection types to support the telecommunication services described in the GSM 02-series of specifications.

In fact GSM can be treated as an example of a PLMN system.

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

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

However, global roaming has to be activated and both incoming and outgoing calls are charged to this account, and the call rate is around US $ 4 per minute ; the incoming calls are via the GSM phone number of the account, with country code, etc., prefixed.

In countries without a central database, like the UK, it might be necessary to query the GSM network about which home network a mobile phone number belongs to.

Many services have moved from traditional UHF / VHF sets, which can be monitored externally, to more secure systems, such as those working on a GSM system, such as TETRA.

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

The Sharp Jump is different as it is possible to change the network APN, and will work with voice and data anywhere in the world provided the phone is unlocked and a compatible GSM or UMTS network is available.

With the introduction of digital transmission in TDMA-based systems like GSM, CSD provided almost direct access to the underlying digital signal, allowing for higher speeds.

CT2's successor, DECT, was provided with an interworking profile, GIP so that GSM networks could make use of it for microcellular access, but in practice the success of GSM within Europe, and the ability of GSM to support microcells without using alternative technologies, meant GIP was rarely used, and DECT's use in general was limited to non-GSM private networks, including use as cordless phone systems.

The GCF certification process is based on technical requirements as specified within dedicated test specifications provided by the 3GPP, OMA, IMTC, the GSM Association and others.

Support for the older GSM and GPRS networks was also provided.

Through an agreement with Dobson Communications Systems, which provided TDMA and GSM cellular service under the Cellular One brand, GCI formerly sold GSM cellular service under its own name while providing Dobson with the back-end network infrastructure.

Their mobile services are provided over the 900 & 1800 MHz GSM band and as July 2005, the 2100 MHz UMTS band.

UMTS service is often provided from the same cell site as 900 MHz and / or 1800 MHz GSM services.

The company provided GSM phone service, supported by LMDS and backbone networks, and

The services provided by Telesur include telephone, internet and wireless GSM, CDMA services.