Motorola moto g7 PLUS User Manual page 180

Settings : Security & location
4.
Turn Lock SIM card on
5. Enter your carrier-provided PIN and follow the onscreen instructions.
Unlock SIM card
When prompted, enter the PIN used to set up the SIM lock.
Caution: If you enter an incorrect PIN multiple times, the SIM will be disabled.
If you accidentally disabled SIM
If you enter an incorrect PIN multiple times, the SIM will be disabled.
Contact your carrier for a PIN unlock key (PUK) to re-enable the SIM.
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