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If the wrong PIN is entered more than three times, the SIM card will become locked.

Without this, functions such as phone calls (except for emergency calls), text messages and mobile data will not be available. After switching on the phone, if the PIN security function is active, the user is required to enter a 4-8 digit PIN to unlock the SIM card and connect to the mobile network. Most mobile phones offer the feature of PIN protection. SIM Card Puk Code UnlockĪ 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. computer access, door access, car access), internet transactions, or to log into a restricted website. In common usage, PINs are used in ATM or POS transactions, secure access control (e.g.

PINs may be used to authenticate banking systems with cardholders, governments with citizens, enterprises with employees, and computers with users, among other uses. The PIN has been the key to facilitating the private data exchange between different data-processing centers in computer networks for financial institutions, governments, and enterprises. SIM Card Pin LockĪ personal identification number (PIN), or sometimes redundantly a PIN number or PIN code, is a numeric (sometimes alpha-numeric) passcode used in the process of authenticating a user accessing a system. In Europe, the serial SIM number (SSN) is also sometimes accompanied by an international article number (IAN) or a European article number (EAN) required when registering online for the subscription of a prepaid card. SIM cards can also be used in satellite phones, smart watches, computers, or cameras.Ī SIM card contains a unique serial number (ICCID), international mobile subscriber identity (IMSI) number, security authentication and ciphering information, temporary information related to the local network, a list of the services the user has access to, and two passwords: a personal identification number (PIN) for ordinary use, and a personal unblocking key (PUK) for PIN unlocking. SIM cards are always used on GSM phones for CDMA phones, they are needed only for LTE-capable handsets. It is also possible to store contact information on many SIM cards.

SIM Card And All You Need To Know ?Ī SIM card, also known as subscriber identity module or subscriber identification module (SIM), is an integrated circuit running a card operating system (COS) that is intended to securely store the international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephony devices (such as mobile phones and computers). Is another trending topic on Google search engines which we will provide solutions and steps you can follow to unblock your sim card without puk code.