Protecting your SIM card with a PIN
Add another layer of security for HTC One V by assigning a PIN (personal identification number) to your SIM. Make sure you have the default SIM PIN provided by your mobile operator before continuing.
1. Slide the Notifications panel open, and then tap Settings > 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 V. 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.

Protecting HTC One V with a screen lock
Protect your personal information and prevent others from using HTC One V without your permission by setting a screen lock pattern, PIN, or password. You'll be asked to unlock the screen every time HTC One V is turned on or when it’s idle for a certain period of time.
1. Slide the Notifications panel open, and then tap Settings > Security.
2. Tap Screen lock.
3. Select a screen lock option and set up the screen lock.
4. Tap Lock phone after, then specify the idle time before the screen is locked. You can also clear Make pattern visible or Make passwords visible if you don’t want your screen lock to display as you enter it onscreen.

Forgot your screen lock pattern?
If you’ve forgotten your screen lock pattern, you have up to five attempts to try and unlock HTC One V. If this fails, you can unlock HTC One V by entering your Google Account user name and password.
1. On the unlock screen, enter your lock pattern.
2. After the fifth attempt, when you’re asked to wait for 30 seconds, tap OK.
3. If the display goes off, press the POWER button to turn the display back on, and then unlock the screen.
4. Tap the Forgot pattern? button when it appears.
5. Enter your Google Account name and password, and then tap Sign in. You’ll then be asked to create a new screen lock pattern. If you no longer want to do so, tap Cancel.

Encrypting data on HTC One V
You can encrypt data such as your online accounts, settings, music files and other media. After encryption, you will need to enter the screen lock PIN or password to turn on your phone and access the data.
  • Set a lock screen PIN or password before encrypting your data.
  • Fully charge the battery and keep HTC One V connected to the power adapter during encryption. The encryption process takes about an hour.

You cannot undo encryption. If you want to return to an unencrypted phone, you must perform a factory reset.
1. Slide the Notifications panel open, and then tap Settings.
2. Tap Storage.
3. Select the encryption option for the type of storage you want to encrypt.
4. Tap Encrypt.
5. Enter the lock screen PIN or password.
6. Tap Next.
7. Tap Encrypt.
Encryption starts and the progress is displayed. The phone may restart a few times. When the encryption process is complete, enter your PIN or password.

See More: Protect/Lock Your HTC One V