By default, the SIM card is protected by a PIN, which makes unauthorized access almost impossible, since the SIM card is automatically locked after three incorrect PIN entries and can only be unlocked again by entering the PUK number.

If desired, the SIM lock can be completely deactivated if the password and PIN entry is considered annoying, for example, because an additional screen lock has been set up on the OnePlus smartphone.

However, it should be noted that a disabled SIM lock provides all the data and access to the SIM card, even if it has been inserted in another device.

Android 10 | OxygenOS 10.0
Step 1:  Open the  Settings
Step 2:  Tap on  Security & lock screen
Step 3:  Tap on  SIM card lock
Step 4:  Choose the  SIM card   (Dual SIM)
Step 5:  Enable or disable  Lock SIM card
Step 6:  Enter the current  SIM   PIN  and tap  OK
  1. Open the Settings
  2. Tap on Security & lock screen
  3. Tap on SIM card lock
  4. Choose the SIM card (Dual SIM)
  5. Enable or disable Lock SIM card
  6. Enter the current SIM PIN and tap OK

OnePlus Instructions
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