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.

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.

AMPS was originally standardized by ANSI as EIA / TIA / IS-3.

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.

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.

* 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.

Telstra deployed a CDMA network, which did not suffer this limitation, and while the AMPS network was closed down at the end of 1999 in the major cities, the closure deadline was extended until the end of 2000 in rural areas to ease the transition to CDMA.

It was the third largest AMPS network, by subscribers, in the world at the time of its turndown.

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.

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 ").

This technology, similar to AMPS, was also used in the UK by Vodafone and Cellnet.

Telecom originally operated a TDMA ( AMPS, Digital D-AMPS / TDMA ) mobile network ; this was superseded by its CDMA network.

The station moved from channel 79 to channel 57 on July 1, 1983, because of complaints that it was interfering with mobile radio in the Toronto area, and so that the frequencies used by channels 70 to 83 could be reclaimed for use by new AMPS mobile phones as a result of a CCIR international convention in 1982.

Out of the 1G standards, the most successful was the AMPS system.

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

* 1990: analog AMPS was superseded by Digital 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.

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

AMPS technology was discontinued in the United States in 2008.

Telus Mobility discontinued its AMPS analog network in February 2008, and launched its HSPA + network in November 2009.

Due to the age and security problems of this technology, Telus Mobility discontinued its AMPS analog mobile network in 2008.

Advanced Mobile Phone System ( AMPS ) is an analog mobile phone system standard developed by Bell Labs, and officially introduced in the Americas in 1978, Israel in 1986, and Australia in 1987.

* Telstra ( formerly Telecom Australia )-operated an AMPS network in Australia from February 1987 until the end of 2000.

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.

Others include AMPS ( Advanced Mobile Phone System ) used in the North America and Australia, TACS ( Total Access Communications System ) in the United Kingdom, C-450 in West Germany, Portugal and South Africa, Radiocom 2000 in France, and RTMI in Italy.

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

In September 1999, Vodafone AirTouch announced a $ 70-billion joint venture with Bell Atlantic to be called Verizon Wireless, which would be composed of the two companies ' U. S. wireless assets, Bell Atlantic Mobile ( another AMPS spinoff ) and AirTouch Cellular.

What really separated AMPS from older systems is the " back end " call setup functionality.

In AMPS, the cell centers could flexibly assign channels to handsets based on signal strength, allowing the same frequency to be re-used in various locations without interference.

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

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.

AMPS cellular service operated in the 800 MHz Cellular FM band.

Each AMPS channel has a one way bandwidth of 30 kHz, for a total of 60 kHz for each duplex channel.

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.

AMPS and D-AMPS have now been phased out in favor of either CDMA2000 or GSM which allow for higher capacity data transfers for services such as WAP, Multimedia Messaging System ( MMS ), and wireless Internet access.

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

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.

Rogers Wireless has dismantled their AMPS ( along with IS-136 ) network ; the networks were shut down May 31, 2007.

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.

In 2006, ADT asked the FCC to extend the AMPS deadline due to many of their alarm systems still using analog technology to communicate with the control centers.

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