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A SIM lock, simlock, network lock, carrier lock or (master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks.
A CDMA subscriber identity module (CSIM) is an application to support CDMA2000 phones that runs on a UICC, with a file structure derived from the R-UIM card. By porting the application to the UICC (Universal Integrated Circuit Card), a card with CSIM, SIM , and USIM can operate with all major cellular technologies worldwide.
Removable User Identity Module (R-UIM, usually pronounced as "R-yuim") is a card developed for cdmaOne/CDMA2000 ("CDMA") handsets that extends the GSM SIM card to CDMA phones and networks. To work in CDMA networks, the R-UIM contains an early version of the CSIM application. The card also contains SIM (GSM) application, so it can work on both ...
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 T-Mobile. UScellular United States: CDMA2000 1xRTT, EV-DO Rev. A 800 / 1900 Oct 2002 Jan 2024 [179] [180] [181] Gradual EV-DO shut down since Oct 2021. Network shutdown was originally scheduled for 14 Jan 2024, but finally concluded on 19 Jan 2024. Verizon United States: CDMA2000 1xRTT, EV-DO Rev. A 800 / 1900 Jan 2002: Dec ...
More: Best Cheap Cell Phone Plans of 2023. Other competitive cell phone plans include Mint Mobile, which offers a $30/month unlimited data plan, and T-Mobile, which offers the same for $50/month ...
This predates and is distinct from its use in mobile phones. The Qualcomm standard IS-95, marketed as cdmaOne. The Qualcomm standard IS-2000, known as CDMA2000, is used by several mobile phone companies, including the Globalstar network. [nb 1] The UMTS 3G mobile phone standard, which uses W-CDMA. [nb 2]
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.
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