The SIM Card has a security feature called the PIN / PUK- a four-digit number. You can change this number to any four-digit number of your choice using the handset. Once set, three wrong attempts of entering the PIN / PUK can get the SIM card blocked temporarily. It now requires the Master PIN / PUK number to unblock the SIM. Generally ten wrong attempts to enter the PUK number can get the SIM card blocked permanently and it will require a SIM exchange.
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