what is cdma2000 technology and cdma2000 phone

CDMA2000 is a hybrid 2.5G / 3G technology of mobile telecommunications standards that use CDMA, a multiple access scheme for digital radio, to send voice, data, and signalling data (such as a dialed telephone number) between mobile phones and cell sites. CDMA2000 is considered a 2.5G technology in 1xRTT and a 3G technology in EVDO.

CDMA (code division multiple access) is a mobile digital radio technology where channels are defined with codes (PN sequences). CDMA permits many simultaneous transmitters on the same frequency channel, unlike TDMA (time division multiple access), used in GSM and D-AMPS, and FDMA, used in AMPS (“analog” cellular). Since more phones can be served by fewer cell sites, CDMA-based standards have a significant economic advantage over TDMA- or FDMA-based standards.

CDMA2000 has a relatively long technical history, and remains compatible with the older CDMA telephony methods (such as cdmaOne) first developed by Qualcomm, a commercial company, and holder of several key international patents on the technology.

The CDMA2000 standards CDMA2000 1xRTT, CDMA2000 EV-DO, and CDMA2000 EV-DV are approved radio interfaces for the ITU’s IMT-2000 standard and a direct successor to 2G CDMA, IS-95 (cdmaOne). CDMA2000 is standardized by 3GPP2.

CDMA2000 is a registered trademark of the Telecommunications Industry Association (TIA-USA) in the United States, not a generic term like CDMA. (This is similar to how TIA has branded their 2G CDMA standard, IS-95, as cdmaOne.)

CDMA2000 is an incompatible competitor of the other major 3G standard UMTS. It is defined to operate at 450 MHz, 700 MHz, 800 MHz, 900 MHz, 1700 MHz, 1800 MHz, 1900 MHz, and 2100 MHz.

The BlackBerry Curve 8900 is a new mobile phone developed by Research In Motion. Its project name was Javelin. The official release on T-Mobile USA is February 11, 2009.[1] It was first thought to be a part of the latest 9000 series phones, however it was revealed to be an 8900 series due to the lack of 3G, unlike the BlackBerry Bold, and will officially be called the BlackBerry Curve 8900.[2] The Curve 8900 is a Quad-band GSM/EDGE phone, unlike the BlackBerry Niagara which is an EV-DO device, both with WI-FI and GPS. In the Blackberry model lineup, the Curve 8900 appears is a replacement for the very popular older BlackBerry Curve 8300 and appears to be an upgrade in most all aspects and features. The most significant differences to the recently released and related Blackberry Bold is the Curve 8900 is smaller and has a better camera, but lacks the faster 3G support of the Bold. Other less significant differences compared to the Bold are smaller but higher resolution Curve 8900 screen, different USB port (mini vs. micro), Curve 8900′s smaller keyboard, Curve 8900′s improved “Atomic” trackball, Curve 8900′s less impressive speaker performance, Curve 8900′s more internal memory, Curve 8900′s slightly slower processor, and a speculated lower price for the Curve 8900.

[edit] Specifications
The BlackBerry Curve 8900 has the following features:

3.2 Mega Pixel camera with flash and autofocus (best BlackBerry camera to date, same as new touchscreen Blackberry Storm)
GPS – internal GPS with extended ephemeris, BB Maps is standard
MP3/WMA/AAC+ media player
DivX/WMV/XviD/3gp video player
WiFi/UMA
Bluetooth v2.0, Bluetooth Stereo Audio via A2DP and AVCRP
Browser – HTML browsing, View Movies/Clips from websites built for mobile streaming, RSS feed support

The HTC Touch Diamond, also known as the HTC P3700 or its codename the HTC Diamond[1], is a Windows Mobile 6.1-powered luxury Pocket PC designed and manufactured by HTC. It is the first device to feature TouchFLO 3D – a new version of the TouchFLO interface, unique to the Touch family.[2] The HTC Touch Diamond was first available in Hong Kong in late May 2008.[3][4] It was available across all major European carriers in June 2008, and will be available later in the year in other parts of the world[5]. The American Touch Diamond was launched on September 14th 2008 on the Sprint[6] network. Verizon Wireless[7] will also carry the Touch Diamond in the U.S.. The European release date was slightly delayed by a last-minute ROM update.[8] The carrier bound names for this phone include T-Mobile MDA Compact IV[3], O2 XDA Diamond[9] and O2 XDA Ignito.[10] It is the official successor of the HTC Touch.[11]

Related posts:

1. My Touch 3G coming: features and specifications
2. Windows Phone 7 to launch in soon
3. About BlackBerry Torch and it’s price
4. Mark Anderson: Tech Trends to Expect in 2009