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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 unlock codes retrieved must be entered into the mobile phone using the keypad. For DCT4 and DCT3 Nokia, unlock codes consist of a "#" key, followed by "pw+", 10 (DCT3) or 15 (DCT4) digits, "+", and another number ranging from 1-7, and finally ends with a "#". Depending on the carrier which the phone is locked to, only some codes will work ...
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).
One of the key features of GSM is the Subscriber Identity Module, commonly known as a SIM card. The SIM is a detachable smart card [2] containing a user's subscription information and phone book. This allows users to retain their information after switching handsets. Alternatively, users can change networks or network identities without ...
USSD can also be used to refill the balance on the user's SIM card and to deliver one-time passwords or PIN codes. Some operators use USSD to provide access to real-time updates from social-networking websites including Facebook and Twitter. [3] Between 2012 and 2018, the Wikipedia Zero project provided access to Wikipedia articles via USSD. [4]
Similarly, another developer from XDA Developers launched a service to allow users to unlock the bootloaders of Samsung Galaxy S20 and Samsung Galaxy S21 Phones. Huawei announced plans to allow users to unlock the bootloader of the Mate 30 series, but later retracted that. [21] Huawei has stopped providing bootloader unlock codes since 2018. [22]