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In mobile telephony, a Subscriber Identity Module Personal Identification Number (SIM PIN) is a numeric password used to control access to SIM card data (stored phone numbers, for example). When a user enables SIM PIN, data on the card can be read only when the correct PIN is entered. The SIM PIN remains active when the card is used in a different device. If a user enters an incorrect PIN three times, the SIM card becomes blocked. In this case, the PIN will no longer unlock the card and the Personal Unblocking Key (PUK) must be used to gain access.