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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 ...
Operator acquired by AT&T. MetroPCS United States: CDMA2000 1xRTT, EV-DO Rev. A 1900 Feb 2002: Jun 2015 [172] [173] Operator acquired by T-Mobile. Sprint (incl. Open Mobile) United States Puerto Rico U.S. Virgin Islands: CDMA2000 1xRTT, EV-DO Rev. A 800 (BC10) 1900 Aug 2002: Mar 2022 [174] [175] [176] Operator acquired by T-Mobile. UScellular ...
Technologies like AMPS, TDMA, iDEN and CDMA 1x/EV-DO were used in the past by some of those networks and have been phased out in favor of newer systems. On 20 April 2022, Oi ’s mobile network operations were sold to the country's three largest carriers, Vivo , Claro and TIM . [ 36 ]
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.
This was later changed to 6 half rate time slots for more compressed calls. It was once prevalent throughout the Americas, particularly in the United States and Canada since the first commercial network was deployed in 1993 on AT&T and Rogers Wireless Networks. IS-95 was the first ever CDMA
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 ...
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 ...
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