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In 3G, the most prevalent technology was UMTS with CDMA-2000 in close contention. All radio access technologies have to solve the same problems: to divide the finite RF spectrum among multiple users as efficiently as possible. GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA. WiMAX and LTE use OFDM.
CDMA: CDMA2000, EV-DO: 13 (at peak) September 2013: Acquired by Verizon Wireless and AT&T Mobility. [39] AT&T Wireless Services: GSM: EDGE: 22: October 2004: Acquired by Cingular Wireless, which later rebranded to AT&T Mobility. [40] Big Sky Mobile: GSM: EDGE: Unknown: 2017: Sold spectrum licenses to AT&T and T-Mobile and exited the business ...
Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.
It is a backwards-compatible successor to second-generation cdmaOne (IS-95) set of standards and used especially in North America and South Korea, China, Japan, Australia and New Zealand. It was standardized in the international 3GPP2 standards body, The name CDMA2000 denotes a family of standards that represent the successive, evolutionary ...
In Russia and some other countries, local carriers received licenses for 450 MHz frequency to provide CDMA mobile coverage area. Many GSM phones support three bands (900/1,800/1,900 MHz or 850/1,800/1,900 MHz) or four bands (850/900/1,800/1,900 MHz), and are usually referred to as tri-band and quad-band phones, or world phones ; with such a ...
GSM 1900: NE Alabama; acquired by AT&T in 2008 310: 320: Cellular One: Smith Bagley, Inc. Operational: GSM 850 / GSM 1900 / UMTS / LTE: Arizona / New Mexico [108] 310: 330: Wireless Partners, LLC: Unknown: LTE: Former AN Subsidiary LLC, [85] AWCC, [147] acquired by AT&T, CDMA shut down February 2015 [134] [112] 310: 340: Limitless Mobile ...
However, Cricket's CDMA network was shut down and the spectrum was reframed for use on AT&T's HSPA+ and LTE networks. Following the acquisition by AT&T, Cricket Wireless released devices that use AT&T's 3G, 4G, and 4G LTE networks. Cricket Wireless noted on its old website that CDMA service would be terminated as early as September 2015.
These phones include combination of GSM and CDMA technology. They can be used as a GSM or CDMA phone according to the user's preference. These handsets are also called global phones. An example of this is the Samsung SCH-A790. These dual-mode handsets are compatible with both GSM and CDMA networks and are essentially two phones in one device.
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