1. Be sure you have the previous PIN. If you don't, contact your carrier for a PIN unlock key (PUK).
2. Go to Settings > Security & privacy > More security settings.
3. Touch SIM card lock.
4.
If Lock SIM card is off, turn it on .
5. Touch Change SIM PIN.
6. Enter the previous PIN and touch OK.
7. Enter a new PIN and touch OK.
8. Re-enter the new PIN and touch OK.
Settings : Security & privacy : More security settings 213
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