Later, many AMPS networks were partially converted to D-AMPS, often referred to as TDMA ( though TDMA is a generic term that applies to many cellular systems ).

There are some phones capable of supporting AMPS, D-AMPS and GSM all in one phone ( using the GAIT standard ).

All Alltel AMPS and D-AMPS service was discontinued in September 2008

* AT & T Mobility-In areas where AT & T Mobility previously had D-AMPS operating on 1900 MHz frequencies, no analog AMPS network existed, and the D-AMPS network on the 1900 MHz frequency was shut down in mid-2007.

Service on the remaining 850 MHz AMPS markets was discontinued along with 850 MHz D-AMPS service on February 18, 2008, except in areas where service was provided by Dobson Communications.

This frequency band was designated by the United States FCC and Industry Canada to be used for new wireless services to alleviate capacity caps inherent in the original AMPS and D-AMPS cellular networks in the 800-894 MHz frequency band ( commonly referred to as the " 850 MHz band ").

* D-AMPS: Digital Advanced Mobile Phone Service, an upgraded version of AMPS, is being phased out due to advancement in technology.

Telecommunications in Cuba consists mainly of NTSC analog television, analog radio, telephony, AMPS, D-AMPS, and GSM mobile telephony, and the Internet.

Telecom originally operated a TDMA ( AMPS, Digital D-AMPS / TDMA ) mobile network ; this was superseded by its CDMA network.

IS-54 and IS-136 are second-generation ( 2G ) mobile phone systems, known as Digital AMPS ( D-AMPS ).

D-AMPS uses existing AMPS channels and allows for smooth transition between digital and analog systems in the same area.

It is a digital extension of AMPS and so it is also quite widely known as Digital AMPS ( D-AMPS ).

An AMPS / IS-54 infrastructure can support use of either analog AMPS phones or D-AMPS phones.

The most widely used of these technologies is called Digital AMPS, or D-AMPS.

It ran AMPS and D-AMPS across most of the territory covered by the BellSouth landline company.

VimpelCom was founded in 1992 and initially operated AMPS / D-AMPS network in Moscow area.

Houston Cellular was a Houston-based cell phone company which provided AMPS and D-AMPS ( TDMA ) service in the Greater Houston area.

The first mobile telephone system was Cubacel, using AMPS and later D-AMPS.

As of February 18, 2008, carriers in the United States were no longer required to support AMPS and companies such as AT & T and Verizon have discontinued this service permanently.

AMPS networks have been replaced by digital networks based on standards including Digital AMPS, GSM, and CDMA2000 which brought improved security as well as increased capacity.

All AMPS carriers have converted most of their consumer base to a digital standard such as CDMA2000 or GSM and continue to do so at a rapid pace.

Unlike in the United States, the Canadian Radio-television and Telecommunications Commission ( CRTC ) and Industry Canada have not set any requirement for maintaining AMPS service in Canada.

* Bell Mobility and Telus Mobility operated AMPS networks in Canada, though they have since been overlaid with digital services.

Both the AMPS and IS-136 networks have been decommissioned ; they were shut down on May 31, 2007.

It has now phased out the older 025 prefix since the prefix was only used by its now redundant AMPS and TDMA networks.

The service was discontinued in conjunction with the retirement of the parent AMPS service ; it has been functionally replaced by faster services such as 1xRTT, EV-DO, and UMTS / HSPA.

The Oki 900 was the ultimate tool of cell phone hackers because it could listen in to AMPS phone calls right out of the box with no hardware modifications.

Ananda Marga counts hundreds of missions around the world through which its members carry out various forms of selfless service on Relief ( The social welfare and development organization under AMPS is Ananda Marga Universal Relief Team, or AMURT., Education and women's welfare ( The service activities of this section founded in 1963 are focused on: 1-Education: creating and managing primary, post primary and higher schools, research institutes etc., 2-Relief: creating and managing children's and students ' homes for destitute children and for poor students, cheap hostels, retiring homes, academies of light for deaf dumb and crippled, invalid homes, refuge reabilitation etc., 3-Tribal: tribal welfare units, medical camps etc., 4-Women's welfare: women welfare units, women's homes, nursing homes etc.

Following both events, Telus began a slow phasing out of CDMA devices, especially those that support both AMPS and CDMA technologies.

It carried out AMPS services until 2004, when the company launched GSM services as well.

Phones compliant with the GAIT standard can operate on either contemporary GSM networks, or the legacy IS-136 TDMA and AMPS networks found extensively throughout North America.

* Telecom New Zealand — Operated an AMPS / TDMA network in New Zealand from 1987 until 2007 throughout the whole country and the network was renowned for its superb coverage, In 2000 Telecom announced that they would discontinue the AMPS network within 5 years ( 2005 ) to give customers an opportunity to transition to the CDMA2000 and later 1XRTT technologies that replaced it.

Alltel, who primarily uses CDMA2000 technology but acquired a TDMA network from Western Wireless, shut down its TDMA and AMPS networks in September 2008.

* Nokia 3205-Operates on CDMA 800 / 1900 and AMPS 800 with CDMA2000 1xRTT technology.

As part of the introduction of mobile phone competition in Australia, the Australian government mandated GSM as the new standard for mobile networks, and required that Telstra close the AMPS network by 2000.

It also operates a cellular telephone service on the AMPS and GSM platforms.

The usage by a subscriber in a visited network is captured in a file called the TAP ( Transferred Account Procedure ) for GSM / CIBER ( Cellular Intercarrier Billing Exchange Record ) for CDMA, AMPS etc ... file and is transferred to the home network.

These are available in Code Division Multiple Access ( CDMA ), Digital Enhanced Cordless Telecommunications – DECT ( TDMA / DCA ) ( See ETSI 6 EN 300 765-1 V1. 3. 1 ( 2001-04 ) -" Digital Enhanced Cordless Telecommunications ( DECT ); Radio in the Local Loop ( RLL ) Access Profile ( RAP ); Part 1: Basic telephony services "), Global System for Mobile Communications ( GSM ), IS136 Time Division Multiple Access ( TDMA ) as well as analog access technologies such as Advanced Mobile Phone System ( AMPS ), for which there will be independent standards defining every aspect of modulation, protocols, error handling, etc.

Some current and historical reuse patterns are 3 / 7 ( North American AMPS ), 6 / 4 ( Motorola NAMPS ), and 3 / 4 ( GSM ).

Rogers began with an Advanced Mobile Phone System ( AMPS ) network, and later moved to the IS-136 standard before finally introducing a GSM network in 2001.

They are externally similar to the 3310 and 3390, but use Digital AMPS (" TDMA ")/ AMPS technology rather than GSM.

Dobson used a TDMA and GSM network ; Western Wireless used a GSM, AMPS, TDMA and CDMA network.

A GAIT-compliant mobile phone typically accepts a SIM card, similar to a standard GSM phone ; however, depending on the wireless provider, the SIM card enables access not only to that wireless provider's GSM network, but also enables use of the telephone on any TDMA or AMPS networks run by the wireless provider.

Rogers Wireless, meanwhile, never offered a GAIT solution to customers, as their entire IS-136 TDMA and AMPS networks were overlaid with GSM by the time the service was launched.

The company operates AMPS and IS-136 networks on the 800 / 850 MHz band and a GSM network on the 1800 MHz ( DCS ) band in its licensed coverage area, the state of Minas Gerais.

However, reducing interference is a significant component in how GSM and other TDMA based mobile phone systems make better use of the available spectrum compared to older analog systems such as AMPS and NMT.

When talking about IS-95 / GSM multi-mode phones, for example, or AMPS / IS-95 phones, the base band processing is very different from system to system.

Telcel provides services in AMPS, GSM, and TDMA, as well as the newer technologies of UMTS and WCDMA.