# PIN Security Settings

You can enable the PIN verification, and the PIN protects your UIM card, SIM card or USIM card against unauthorized use.

- Enabling and Disabling PIN Verification
  When the PIN verification is enabled, next time you launch the Mobile Partner, you need to enter the PIN. When the PIN verification is disabled, next time you launch the Mobile Partner, you do not need to enter the PIN.
- Changing the PIN
  By changing the PIN, you can enhance the effectiveness of PIN protection.
- Verifying the PIN
  When the PIN verification is enabled, you need to enter the PIN to launch the Mobile Partner. The network-related functions (including accessing the Internet) of the UIM card, SIM card, or USIM card can be used only after the correct PIN is entered.
- Unlocking with PUK
  A locked UIM card, SIM card, or USIM card can be unlocked by the PIN Unblocking Key (PUK).

Parent topic: User Manual