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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.
The other aspects being that the SIM is now structured into "domains" that separate the operator profile from the security and application "domains". In practise "eSIM upgrade" in the form of a normal SIM card [4] is possible (using the Android 9 eSIM APIs) or eSIM can be included into an SOC. [5]
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.
STK has been deployed by many mobile operators around the world for many applications, often where a menu-based approach is required, such as Mobile Banking and content browsing. [1] Designed as a single application environment, the STK can be started during the initial power up of the SIM card [ 5 ] and is especially suited to low level ...
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.
An eSIM (embedded SIM) is a form of SIM card that is embedded directly into a device as software installed onto a eUICC chip. First released in March 2016, eSIM is a global specification by the GSMA that enables remote SIM provisioning ; end-users can change mobile network operators without the need to physically swap a SIM from the device.
GSM is the world's predominant mobile phone standard. The design of the service is moderately complex because it must be able to locate a moving phone anywhere in the world, and accommodate the relatively small battery capacity, limited input/output capabilities, and weak radio transmitters on mobile devices.
A typical SIM card (mini-SIM with micro-SIM cutout) A SIM (Subscriber Identity Module) card is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).