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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. This is in contrast to a phone (retrospectively called SIM-free or ...
SIM cards are identified on their individual operator networks by a unique international mobile subscriber identity (IMSI). Mobile network operators connect mobile phone calls and communicate with their market SIM cards using their IMSIs. The format is: The first three digits represent the Mobile country code (MCC).
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 ...
Software support for the first Apple Watch ended with watchOS 4.3.2. Second generation (Series 1 and 2) Apple S2. The second generation Apple Watch has two models; the Apple Watch Series 1 and Apple Watch Series 2. The Series 1 has a variant of the dual-core Apple S2 processor with GPS removed, known as the Apple S1P.
Touch ID is an electronic fingerprint recognition feature designed and released by Apple Inc. that allows users to unlock devices, make purchases in the various Apple digital media stores ( iTunes Store, App Store, and Apple Books Store ), and authenticate Apple Pay online or in apps. It can also be used to lock and unlock password-protected ...
Siri, Apple's voice assistant, is supported on the iPhone 4s only. It was later extended to other devices (such as the iPhone 5) in iOS 6 and expanded further with each new major software release. App features Photos and Camera. The first iOS 5 release allowed the Camera app to be easily accessed from the lock screen for the first time.
An eSIM ( embedded SIM) is a form of SIM card that is embedded directly into a device. Instead of an integrated circuit located on a removable SIM card, typically made of PVC, an eSIM consists of software installed onto an eUICC chip permanently attached to a device. If the eSIM is eUICC-compatible, it can be re-programmed with new SIM information.
Programs to remove SIM lock restrictions are available, but are not supported by Apple, and most often not a permanent unlock – a soft unlock, which modifies the iPhone so that the baseband will accept the SIM card of any GSM carrier. SIM unlocking is not jailbreaking, but a jailbreak is also required for these unofficial software unlocks.