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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.
GSM: (SIM unlock) globe smart sun Alltel or Verizon Wireless do not use any type of subsidy locks on their CDMA phones. Default Code:000000 or 123456 or 654321 Prepaid cellphones from Alltel & Verizon Wireless come locked from the store, but Verizon Wireless prepaid cellphones can be unlocked with a call to Verizon.
Operator acquired by T-Mobile. UScellular United States: CDMA2000 1xRTT, EV-DO Rev. A 800 / 1900 Oct 2002 Jan 2024 [177] [178] [179] 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 ...
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.
The phone originally was released in an unlocked GSM format. The updated release of the phone for CDMA networks featured new hardware specifications, including a more powerful processor, more storage, and less user-available RAM. Mobile phone, CDMA model with 800/1900 MHz bands, with EV-DO Rev.A data. Unlocked GSM model also available
A CDMA2000 mobile phone. Synchronous CDM (code-division 'multiplexing', an early generation of CDMA) was implemented in the Global Positioning System (GPS). This predates and is distinct from its use in mobile phones. The Qualcomm standard IS-95, marketed as cdmaOne.
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