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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.
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 ...
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.
Additionally, certain Verizon-compatible handsets were blocked from Verizon's CDMA network even before December 31, 2022, even if the device supported CDMA (for instance, unlocked devices with support for Sprint or China Telecom), therefore requiring VoLTE support when used on Verizon.
AT&T: AT&T Mobility: Operational: GSM 850 / UMTS 850 / UMTS 1900: Originally BellSouth Mobility DCS, then Cingular Wireless, [82] then Aio Wireless, then rebranded as the new GSM Cricket Wireless: 310: 160: T-Mobile: T-Mobile US: Operational: GSM 1900 [82] GSM to shut down Sep 2024 [140] 310: 170: AT&T: AT&T Mobility: Operational: GSM 1900
The CDMA A1429 model works on CDMA networks, such as that of Sprint and Verizon. Another version supports LTE only on the 1700/2100 MHz AWS band, and the 700 MHz band recovered after the conversion to digital television in the US (channels 52 to 56), currently the only network that supports the band is AT&T. GSM A1429 supports several other LTE ...
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.
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