HT201328: How to unlock your iPhone for use with another carrier
Learn about How to unlock your iPhone for use with another carrier
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Helpful answers
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Apr 30, 2014 7:06 AM in response to nicholaskuhnertby Rojmer,That is your Sim card PUK code.
This is a code that is required to unblocked your Sim card if it gets locked for any reason, for example, by using an incorrect SIM pin a few times. It is a security code,
Some carriers give the user the PUK code printed on the card and others do not. In this last case you need to contact the carrier to get the PUK code.
Look in the original card your Sim came attached to, to see if it contains a PUK code. If not or if you were not given the original card, contact your carrier.