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Every SIM card comes with a PIN lock as standard to prevent unauthorized access, so when we start the Xiaomi smartphone, we are first asked for the PIN and then for the unlock pattern or code. If this is too much code entry, you can deactivate the SIM PIN lock if you wish.

Note: If the SIM lock is deactivated, the SIM card is unprotected, which means that if you put the SIM into another smartphone, you have immediate access to all SIM applications and services.

Android 11 | MIUI 12.0
Step 1: Tap on  Settings
Step 2: Tap on  Passwords & security
Step 3: Tap on  Privacy
Step 4: Choose a  SIM card   (Dual SIM)
Step 5: Turn On/Off  Lock SIM card
Step 6: Enter the  current PIN  and tap  OK
  1. Tap on Settings
  2. Tap on Passwords & security
  3. Tap on Privacy
  4. Choose a SIM card (Dual SIM)
  5. Turn On/Off Lock SIM card
  6. Enter the current PIN and tap OK
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Xiaomi Instructions