AMPS is a first-generation cellular technology that uses separate frequencies, or " channels ", for each conversation ( see FDMA ).

AMPS pioneers fathered the term " cellular " because of its use of small hexagonal " cells " within a system.

Laws were passed in the US which prohibited the FCC type acceptance and sale of any receiver which could tune the frequency ranges occupied by analog AMPS cellular services.

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 ).

After that point, however, most cellular companies were eager to shut down AMPS and use the remaining channels for digital services.

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

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 ").

Developed by Bell Labs in the 1970s and first used commercially in the United States in 1983, AMPS operates in the 800 MHz band in the United States and is the most widely distributed analog cellular standard.

IS-54 was, in fact, backward compatible with analog cellular and indeed co-exists on the same radio channels as AMPS.

To maintain compatibility with the existing AMPS cellular telephone system, the primary forward and reverse control channels in IS-54 cellular systems use the same signaling techniques and modulation scheme ( binary FSK ) as AMPS.

* 1978: Bell Labs launched a trial of the first commercial cellular network in Chicago using Advanced Mobile Phone System ( AMPS ).

typically used the Mobile Telephone Service ( MTS ), which was first used in St. Louis, or Improved Mobile Telephone Service ( IMTS ) before giving way to analog cellular service ( AMPS ) in 1984.

These cellular systems were based on US Advanced Mobile Phone Service ( AMPS ) technology, the modified technology being named Total Access Communication System ( TACS ).

Parallel to Improved Mobile Telephone Service ( IMTS ) in the US until the rollout of cellular AMPS systems, a competing mobile telephone technology was called Radio Common Carrier or RCC.

The service was provided from the 1960s until the 1980s when cellular AMPS systems made RCC equipment obsolete.

RCC based services were provided until the 1980s when cellular AMPS systems made RCC equipment obsolete.

While Motorola was developing the cellular phone itself, during 1968-1983, Bell Labs worked on the system called AMPS, which became the first cellular network in the U. S. Motorola and others designed cell phones for that and other cellular systems.

), except the voice channel was analog ( as was the original NMT and AMPS cellular systems ).

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.

In 2002, the FCC decided to no longer require A and B carriers to support AMPS service as of February 18, 2008.

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.

OnStar relied heavily on North American AMPS service for its subscribers because, when the system was developed, AMPS offered the most comprehensive wireless coverage in the US.

* Verizon Wireless — Formerly operating an AMPS network, on February 18, 2008, Verizon has discontinued all AMPS service.

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

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.

* Pelephone-began offering nationwide AMPS service in Israel in 1986.

Cellular Digital Packet Data ( CDPD ) was a wide-area mobile data service which used unused bandwidth normally used by AMPS mobile phones between 800 and 900 MHz to transfer data.

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.

Since then, support for the service has expanded to include other mobile technologies such as ANSI CDMA networks and Digital AMPS, as well as satellite and Landline networks.

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.

Channels 70 through 83 were removed from the bandplan in the 1980s to make way for AMPS mobile phone service.

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

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.

Cellular South, Inc. began its wireless service on the Mississippi Gulf Coast on February 4, 1988, using AMPS technology.

Bell Mobility and Telus Mobility, who operated AMPS networks in Canada, announced that they would observe the same timetable as outlined by the FCC in the United States, and as a result would not begin to dismantle their AMPS networks until after February 2008.

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

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

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

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

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.

Some multi-mode phones can operate on analog networks as well ( for example, dual band, tri-mode: AMPS 800 / CDMA 800 / CDMA 1900 ).