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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 ...
The assumption is that a customer will buy the handset, and then activate with the SIM-card in the pack, which will eventually lead to the operator making money via top-ups on the phone. Box breakers subvert this by buying the phones, and unlocking the phone (SIM lock) so that it can be used with any SIM-card, i.e. on any network.
O2: 31 August 2023 [61] Stopped accepting new customers August 2023. All customers moved to O2 by December 2023. [62] Vizz Africa: Vodafone? Ceased operations. White Mobile EE: 5 October 2022: Customers told to move to Moblox, which entered administration in April 2023. [63] [64] Zevvle EE: December 2023: Ceased operations. [65]
SIM Application Toolkit (STK) is a standard of the GSM system which enables the subscriber identity module (SIM card) to initiate actions which can be used for various value-added services. [1] Similar standards exist for other network and card systems, with the USIM Application Toolkit (USAT) for USIMs used by newer-generation networks being ...
h2o Wireless is a United States-based prepaid cell phone service, that utilizes the AT&T network. [2] It is a brand of mobile virtual network operator (MVNO) Locus Telecommunications, a subsidiary of Telrite Holdings, Inc., since 2019. [1] [3] Locus was formerly a subsidiary of KDDI America corporation, starting in 2010.
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