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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.
If the wrong PIN is entered more than three times, the SIM card will become locked. It can be unlocked by entering the PUK code provided by the mobile service provider, [1] which may be available on the SIM card's packaging, the contract, or provided by customer service after identity verification. After the PUK code is entered, the PIN must be ...
No. 4 domestic carrier T-Mobile is making a big push, rebranding itself as the "Un-Carrier" and deriding its larger rivals for their subsidizing ways. The company finally got its magenta hands on ...
In some countries, such blocklisting is not customary. In 2012, major network companies in the United States, under government pressure, committed to introducing a blocklisting service, but it's not clear whether it will interoperate with the CEIR. [16] [17] GSM carriers AT&T and T-Mobile began blocking newly reported IMEIs in November 2012. [18]
In addition, some manufacturers prohibit unlocking on carrier locked phones. Although Samsung phones and cellular tablets sold in the US and Canada do not allow bootloader unlocks regardless of carrier status, a service has allowed users on an earlier version to unlock their US/Canadian Samsung phone(s) and/or tablet(s) [18] [19]
Since April 2020, the Assurance Wireless brand has been under the T-Mobile family. [5] This was the result of the merger of Sprint Corporation and T-Mobile US was officially completed, [9] and after Virgin Mobile USA was officially shut down and folded into Boost Mobile. An official statement was sent to all customers July 14, 2020 stating that ...
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