HT201328: How to unlock your iPhone
Learn about How to unlock your iPhone
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Helpful answers
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Apr 4, 2014 9:43 AM in response to carol Daoudby Anthony Hobbs,If you've forgotten the passcode to you're sim, you will need to contact you're carrier to unlock it.
If you know the PIN then go to Settings > Phone > SIM PINAnd if you want more info-http://support.apple.com/kb/ht1316