The PIN of the SIM card can be easily changed on the Oppo smartphone via the security settings.

Note: To change the PIN, the current PIN is required.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  Security
Step 3:  Tap on  SIM card lock
Step 4:  Choose between  SIM1  and  SIM2
Step 5:  Tap on  Change SIM PIN
Step 6:  Enter your current  SIM PIN
Step 7:  Enter new  SIM PIN  and tap on  OK
Step 8:  Enter again new  SIM PIN  and confirm with  OK
  1. Open the Settings
  2. Tap on Security
  3. Tap on SIM card lock
  4. Choose between SIM1 and SIM2
  5. Tap on Change SIM PIN
  6. Enter your current SIM PIN
  7. Enter new SIM PIN and tap on OK
  8. Enter again new SIM PIN and confirm with OK

Oppo Instructions
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