Learn how to Assign PIN To SIM Card on your HTC One M8. You can help to protect the nano SIM card by assigning a PIN that you enter before accessing the nano SIM.
Note
Make sure you have the default PIN of the nano SIM card from your mobile operator before continuing.
Go to Settings, and then tap Security.
Tap Set up SIM card lock, then select Lock SIM card.
Enter the default PIN of the nano SIM card, and then tap OK.
To change the nano SIM card PIN, tap Change SIM PIN.
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 nano SIM card will become PUK-locked.
You need a PUK code to restore access to HTC One. Contact your mobile operator for this code.
On the Phone dialer screen, enter the PUK code, and then tap Next.
Enter the new PIN you want to use, and then tap Next.
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