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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 ...
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.
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.
Cellular Technology: WCDMA (DB-DC-HSDPA, DC-HSUPA), TD-SCDMA, CDMA 1x, EV-DO, GSM/EDGE; Downlink LTE: LTE Category 20 (2000 Mbit/s). 7x20 MHz carrier aggregation. Maximum 20 spatial streams. Up to 256-QAM. Up to 4x4 MIMO on five carriers, Full-Dimension MIMO (FD-MIMO) Uplink LTE: LTE Category 13 (316 Mbit/s). 3x20 MHz carrier aggregation.
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.
up to 25 adjacent 0,2 MHz GSM carriers or one 4,2 MHz W-CDMA carrier flanked with 2x2 0,2 MHz GSM carriers Georgia: MagtiCom: May 2018: 15 MHz, UMTS: 20 MHz, 10 MHz Feb 2015: N/A - 13,2 MHz, GSM: 5 MHz Jun 2016 - - - - 20 MHz (Cat.4) (Feb 2015) 25 MHz (CA_3A_20A) (Cat.6) (Jun 2016) 30 MHz (CA_3C) [4x4 MIMO] (Cat.9) (Sep 2018) [4] [5] [114] [115 ...
The Universal Mobile Telecommunications System (UMTS) is a 3G mobile cellular system for networks based on the GSM standard. Developed and maintained by the 3GPP (3rd Generation Partnership Project), UMTS is a component of the International Telecommunication Union IMT-2000 standard set and compares with the CDMA2000 standard set for networks based on the competing cdmaOne technology.
Although both are different and independent from one another, both the CDMA and UMTS networks use the 850 and 1900 MHz frequencies. Bell's LTE network uses Band 4 Advanced Wireless Services (AWS 1700/2100 MHz) and Band 2 Personal Communications Service (PCS 1900 MHz) in most coverage areas and Band 7 (2600 MHz) in a few areas.