![]() Failing to provide the 4-digit string results in a temporary Sim Lock, which can be lifted by entering the SIM card’s PIN. How To Enable/Disable SIM Lock You can opt that your iPhone requests the PIN code whenever it’s rebooted, or not. Whenever you buy a new SIM Card, it comes with a default PIN code, used for activating it. Each SIM has its own Passcode, called PIN code. Every smartphone needs a SIM card in order to be able to connect to the carrier and receive an allotted phone number. SIM Lock is an additional layer of security that you can use, along with the classic iOS Passcode and more recent Touch ID sensor. It’s kicking in when you reboot your iPhone, or whenever you turn it ON, if the SIM Pin setting is enabled. This limitation doesn’t pop out all of a sudden. This happens because your SIM card is deactivated and you practically don’t have any link with the nearby cellular towers. If your iOS device displays the Locked Sim message, in the top-left corner of the screen, you won’t be able to perform any cellular calls, or benefit from Mobile Data connectivity.
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