HTC U19e User Manual page 38

38 Security
Restoring a nano SIM card that has been locked out
If you enter the wrong PIN more times than the maximum number of attempts allowed, the card
will become "PUK-locked."
You need a Pin Unlock Key (PUK) code to restore access to HTC U19e. Contact your mobile
operator for this code.
1. When prompted, enter the PUK code, and then tap Next.
2. Enter the new PIN you want to use, and then tap Next.
3. Enter the new PIN again, and then tap OK.