Pin/ lock on the sim of lumia 820

how do i put a pin/ lock on the sim of lumia 820 please?

Hi nikkifinn66,
In addition to farby's reply, PIN Code protects your SIM card against unauthorised use and is required to access some network-related features. You can set your phone to ask for the PIN code when you switch it on by going to Settings, flick on Applications, tap Phone, and then switch SIM Security ON. 
Note: If this is the first time a PIN has been set for the SIM card in your phone, type the PIN code you got from the operator, and then tap Enter. 1234 is a common default PIN for some SIM cards. If the PIN code does not work, contact your mobile operator for the correct default PIN.
If you want to customize or personalize the PIN, you just have to go back to Settings, flick on Applications, tap Phone, with SIM security switched on, tap Change SIM PIN (at the bottom). The new SIM PIN must be 4 to 8 digits long.
Hope this helps.
Cheers!

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