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2. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   SIM lock. 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. This is in contrast to a phone (retrospectively called SIM ...

3. Mobile network codes in ITU region 3xx (North America)

   en.wikipedia.org/wiki/Mobile_network_codes_in...

   Mobile network codes in ITU region 3xx (North America) This list contains the mobile country codes and mobile network codes for networks with country codes between 300 and 399, inclusively – a region that covers North America and the Caribbean. Guam and the Northern Mariana Islands are included in this region as parts of the United States.

4. Personal unblocking key - Wikipedia

   en.wikipedia.org/wiki/Personal_unblocking_key

   A personal unblocking key (PUK), sometimes called personal unblocking code (PUC), is used in SIM cards to reset a personal identification number (PIN) that has been lost or forgotten. Most mobile phones offer the feature of PIN protection. After switching on the phone, if the PIN security function is active, the user is required to enter a 4-8 ...

5. Bootloader unlocking - Wikipedia

   en.wikipedia.org/wiki/Bootloader_unlocking

   Bootloader unlocking is the process of disabling the bootloader security that makes secure boot possible. It can make advanced customizations possible, such as installing a custom firmware. On smartphones this can be a custom Android distribution or another mobile operating system. Some bootloaders are not locked at all, others can be unlocked ...

6. List of mobile virtual network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_virtual...

   Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the three major cellular carriers in the countryv—AT&T Mobility, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

7. TracFone Wireless - Wikipedia

   en.wikipedia.org/wiki/TracFone_Wireless

   TracFone Wireless, Inc. (TFWI) was an American wireless service provider.It was a mobile virtual network operator offering prepaid and no-contract service on the AT&T Mobility, T-Mobile US, and Verizon networks [2] under multiple brands, including TracFone, Net10 Wireless, GoSmart Mobile, Page Plus Cellular, SafeLink Wireless, Simple Mobile, Total Wireless, and Straight Talk Wireless (in ...