![]() ![]() ![]() This is in contrast to a phone (retrospectively called SIM-free or unlocked) that does not impose any SIM restrictions. ![]() Technical restriction built into mobile phones by phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networksĪ SIM lock, simlock, network lock, carrier lock or ( master) subsidy lock is a technical restriction built into GSM and CDMA mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks.
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