Alcatel-Lucent has been granted a contract in February 2007 to collocate a CDMA2000 1xEV-DO ( Revision A ) high-speed wireless network in Macau for China Unicom.

Qualcomm was the first company to succeed in developing a practical and cost-effective CDMA implementation for consumer cell phones: its early IS-95 air interface standard, which has since evolved into the current CDMA2000 ( IS-856 / IS-2000 ) standard.

It is standardized by 3rd Generation Partnership Project 2 ( 3GPP2 ) as part of the CDMA2000 family of standards and has been adopted by many mobile phone service providers around the world – particularly those previously employing CDMA networks.

As of end of June 2005, au by KDDI has 20, 122, 700 customers, among which 18, 723, 200 ( 93 %) are 3G CDMA2000 subscribers.

However, D-AMPS has been competing against GSM and systems based on code division multiple access ( CDMA ) for adoption by the network carriers, although it is now being phased out in favor of GSM / GPRS and CDMA2000 technology.

It is standardized by 3rd Generation Partnership Project 2 ( 3GPP2 ) as part of the CDMA2000 family of standards and has been adopted by many mobile phone service providers around the world – particularly those previously employing CDMA networks.

Recently, however, SMV itself has been replaced by the new CDMA2000 4GV codecs.

Since 2008 CDMA2000 and WCDMA is available in certain areas.

Developed and maintained by the 3GPP ( 3rd Generation Partnership Project ), UMTS is a component of the International Telecommunications Union IMT-2000 standard set and compares with the CDMA2000 standard set for networks based on the competing cdmaOne technology.

The main competitor to UMTS is CDMA2000 ( IMT-MC ), which is developed by the 3GPP2.

Unlike UMTS, CDMA2000 is an evolutionary upgrade to an existing 2G standard, cdmaOne, and is able to operate within the same frequency allocations.

Where CDMA2000 is deployed, it usually co-exists with UMTS.

It is now being supplanted by IS-2000 ( CDMA2000 ), a later CDMA-based standard.

Though W-CDMA does use a direct sequence CDMA transmission technique like CDMA2000, W-CDMA is not simply a wideband version of CDMA2000.

The W-CDMA system is a new design by NTT DoCoMo, and it differs in many aspects from CDMA2000.

CDMA2000 ( also known as IMT Multi ‑ Carrier ( IMT ‑ MC )) is a family of 3G mobile technology standards, which use CDMA channel access, to send voice, data, and signaling data between mobile phones and cell sites.

In the United States, CDMA2000 is a registered trademark of the Telecommunications Industry Association ( TIA-USA ).

CDMA2000 1X ( IS-2000 ), also known as 1x and 1xRTT, is the core CDMA2000 wireless air interface standard.

CDMA2000 1xEV-DO ( Evolution-Data Optimized ), often abbreviated as EV-DO or EV, is a telecommunications standard for the wireless transmission of data through radio signals, typically for broadband Internet access.

In practice, 3GPP2 is the standardization group for CDMA2000, the set of 3G standards based on earlier 2G CDMA technology.

3GPP2 should not be confused with 3GPP ; 3GPP is the standard body behind the Universal Mobile Telecommunications System ( UMTS ) that is the 3G upgrade to GSM networks, while 3GPP2 is the standard body behind the competing 3G standard CDMA2000 that is the 3G upgrade to CDMA networks used mostly in the United States ( and to some extent also in Japan, China, South Korea and India ).

D-AMPS is considered end-of-life, and existing networks have mostly been replaced by GSM / GPRS or CDMA2000 technologies.

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.

* the CDMA2000 system, first offered in 2002, standardized by 3GPP2, used especially in North America and South Korea, sharing infrastructure with the IS-95 2G standard.

The project was established in December 1998 and should not be confused with 3rd Generation Partnership Project 2 ( 3GPP2 ), which specifies standards for another 3G technology based on IS-95 ( CDMA ), commonly known as CDMA2000.

Compatibility with CDMA2000 would have beneficially enabled roaming on existing networks beyond Japan, since Qualcomm CDMA2000 networks are widely deployed, especially in the Americas, with coverage in 58 countries.

In particular, OMA specifications for a given function are the same with either GSM, UMTS or CDMA2000 networks.

Nokia developed VMR-WB codec for CDMA2000 networks, which is fully interoperable with 3GPP AMR-WB.

Voice calls in GSM, UMTS and CDMA2000 are circuit switched, so with the adoption of LTE, carriers ( Telecom Operators, e. g., T-mobile, Vodafone, etc.

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

In 2007 this agreement lapsed, and in 2008 some of these customers were transitioned to Telecom New Zealand who serviced them initially with CDMA2000 technology.

This technique is a form of mobile-assisted handover, for IS-95 / CDMA2000 CDMA cell phones continuously make power measurements of a list of neighboring cell sites, and determine whether or not to request or end soft handover with the cell sectors on the list.

TBayTel uses the CDMA2000 technology with 1xRTT and EV-DO for their 3G data speeds.

* 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.

US Cellular, which now also primarily uses CDMA2000 technology, shut down its TDMA network in February 2009.

The cell phones are typically CDMA2000 and IS-95 hybrids.

The elevated structure typically supports antennas, and one or more sets of transmitter / receivers transceivers, digital signal processors, control electronics, a GPS receiver for timing ( for CDMA2000 / IS-95 or GSM systems ), primary and backup electrical power sources, and sheltering.

In the mid-to-late 1990s it converted to IS-95 CDMA and later added CDMA2000 / EV-DO capabilities as well.

Systems based upon CDMA air interfaces such as IS-95 / CDMA2000, and most forms of UMTS, can use a form of implied DTX by usage of a variable rate codec such as AMR.

In a cdmaOne / CDMA2000 (" CDMA ") network, the UICC contains a CSIM application, in addition to 3GPP USIM and SIM applications.