Tele2 operates as one of the largest nationwide 2G / 3G / 4G MNO ( Mobile Network Operator ) in Latvia.

* Bite Latvia ( GSM )

In general terms, AMPS was very similar to the older " 0G " Improved Mobile Telephone Service, but used considerably more computing power in order to select frequencies, hand off conversations to PSTN lines, and handle billing and call setup.

Public Land Mobile Networks need to connect to the Public Switched Telephone Network ( PSTN ) in order to route calls.

Mobile radio telephone systems such as Mobile Telephone Service and Improved Mobile Telephone Service allowed a mobile unit to have a telephone number allowing access from the general telephone network, although some systems required mobile operators to set up calls to mobile stations.

* Improved Mobile Telephone Service

* Mobile Telephone Service

Being one of the very few companies in Malaysia to originally obtain a cellular phone license, it successfully introduced mobile telephony in Malaysia through its ART-900 ( Automatic Radio Telephone ) service, using first generation ( analogue ) ETACS ( Extended Total Access Communication System ) specifications of the United Kingdom, a derivative of the US-AMPS ( Advanced Mobile Phone System ) technology.

The principle is the same with Central Office Switches ( CO Switches ) or Mobile Telephone Switching Office ( MTSOs ).

* Mobile Telephone System, or Manual Tone Shift, an early mobile telephone standard

cs: Nordic Mobile Telephone

de: Nordic Mobile Telephone

fr: Nordic Mobile Telephone

id: Nordic Mobile Telephone

pl: Nordic Mobile Telephone

sk: Nordic Mobile Telephone

th: Nordic Mobile Telephone

uk: Nordic Mobile Telephone

Benefits include higher connection establishment rate, more fraud security ( antiphreaking measures ), and features such as Caller ID ; however, some 911 Public Safety Answering Points ( PSAPs ) still use the MF format to process calls from Mobile Telephone Switching Offices ( MTSOs ) and land telephone offices.

** Nordic Mobile Telephone, an analogue mobile phone system

* This American Life, a popular show on public radio in the United States, has often used the band's " Perpetuum Mobile " to accompany its stories, and news programs on National Public Radio have at times used the ring tone from " Telephone and Rubber Band " as bumper music between pieces.

Mobile networks are diverse and include GSM 850 MHz ( largest ) as well as CDMA ( Bell South's old network before being acquired by Telefónica Spain which rebranded Movistar ), TDMA63.

GSM ( Global System for Mobile Communications, originally ), is a standard set developed by the European Telecommunications Standards Institute ( ETSI ) to describe protocols for second generation ( 2G ) digital cellular networks used by mobile phones.

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 ).

Recent deregulation of the mobile phone market has led to the introduction of Global System for Mobile communication ( GSM ) network providers operating on the 900 / 1800 MHz spectrum, MTN Nigeria, Airtel, Globacom and Etisalat.

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.

SMS as used on modern handsets originated from radio telegraphy in radio memo pagers using standardized phone protocols and later defined as part of the Global System for Mobile Communications ( GSM ) series of standards in 1985 as a means of sending messages of up to 160 characters, to and from GSM mobile handsets.

* Mobile Operators ( largest first ): AIS GSM 900, AIS GSM 1800, DTAC, True Move, Hutch ( taken over by RealMove a subsidiary of True Corp .), CAT CDMA, Thai Mobile 1900 ( inactive ), TOT3G ( i-mobile3GX, IEC3G, i-kool3G, 365 )

TDMA is used in the digital 2G cellular systems such as Global System for Mobile Communications ( GSM ), IS-136, Personal Digital Cellular ( PDC ) and iDEN, and in the Digital Enhanced Cordless Telecommunications ( DECT ) standard for portable phones.

Universal Mobile Telecommunications System ( UMTS ) is a third generation mobile cellular system for networks based on the GSM standard.

UMTS combines three different air interfaces, GSM's Mobile Application Part ( MAP ) core, and the GSM family of speech codecs.

With Mobile Application Part, UMTS uses the same core network standard as GSM / EDGE.

* Global System for Mobile Communications ( GSM ): The GSM network is divided into three major systems: the switching system, the base station system, and the operation and support system.

In 2G ( such as GSM or CDMA ), the terminal adapter is a theoretically optional while in 3G ( such as W-CDMA ), the terminal adapter is mandatory and is part of the Mobile Termination.

The technology used for domestic lines includes microwave radio relay, cable, and Global System for Mobile Communications ( GSM ).

Longer range communications have been proposed using infrastructure networks such as WiMAX ( IEEE 802. 16 ), Global System for Mobile Communications ( GSM ), or 3G.

* Unlicensed Mobile Access, a technology that provides roaming between GSM and 802. 11, based on the 3GPP or Generic Access Network ( GAN ) standard

* Mobile Office Workstations using GSM Links

An International Mobile Subscriber Identity or IMSI () is a unique identification associated with all GSM, UMTS and LTE network SIM cards.

* Mobile station, in GSM system architecture is a station which can freely relocate without any restrictions

Telephone system: Fixed PSTN, GSM 900

In October 1990, it launched analog 900 MHz mobile phone services with a 20 year monopoly concession from the Telephone Organization of Thailand, and later became the first company allowed to operate on the GSM 900 frequency.

CSD uses a single radio time slot to deliver 9. 6 kbit / s data transmission to the GSM Network and Switching Subsystem where it could be connected through the equivalent of a normal modem to the Public Switched Telephone Network ( PSTN ) allowing direct calls to any dial-up service.

Once a mobile phone has successfully attached to a GSM network as described above, calls may be made from the phone to any other phone on the global Public Switched Telephone Network.

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