Samsung Galaxy S4 mini support.
Using a PUK code.
If you enter the wrong PIN three times, your SIM will be locked. You'll need to phone us to get a PUK code to unlock your SIM. Call us on 333 from a Three phone or 0333 338 1001 (standard rates apply) from any other phone to request a PUK code.
Note: Don't try to unlock your SIM without getting a PUK code from us. If you use the wrong one it'll block your SIM completely. If it does get blocked, you'll lose all the information stored on your SIM and you'll need to get a new one.
To unlock your phone using a PUK code:
Enter the PUK code provided then tap OK
Enter your new PIN and tap OK
You'll be asked to confirm your new PIN. Tap OK
Your SIM will now be unlocked.
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