Nokia 3 V user guide
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Change your SIM PIN code
If your SIM card came with a default SIM PIN code, you can change it to something more secure.
Select your SIM PIN
You can choose which digits to use for the SIM PIN. The SIM PIN code can be 4 digits.
Tap Settings > Security & Location > SIM card lock > Change SIM PIN .
Tip: If you don’t want to protect your SIM with a PIN code, switch Lock SIM card to Off , and type in your current PIN.