HTC One max - Assigning a PIN to help protect your SIM card

Assigning a PIN to help protect your SIM card
You can help to protect your SIM card by assigning a PIN (personal
identification number) that you enter before accessing your SIM.
When you're prompted to enter the default SIM PIN, enter 1111.
1. Go to Settings, and then tap Security.
2. Tap Set up SIM card lock, then select Lock SIM card.
3. Enter the default SIM card PIN, and then tap OK.
4. To change the SIM card PIN, tap Change SIM PIN.
Restoring a SIM card that has been locked out
If you enter the wrong PIN more times than the maximum number of
attempts allowed, your SIM card will become “PUK-locked.”
You need a PUK code to restore access to HTC One max. Contact your
mobile operator for this code.
1. On the Phone dialer screen, 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.
320 Settings and security