If Dual SIM is used on the OnePlus smartphone, one SIM card can be deactivated if desired.
Any priorities or settings for accessing mobile data or sending SMS are automatically transferred to the other SIM card.

When a SIM card is deactivated, no calls or SMS messages will be received.

Android 10 | OxygenOS 10.0
Enable or disable SIM card -  Open the  Settings
Enable or disable SIM card -  Tap on  Wi-Fi & network
Enable or disable SIM card -  Tap on  SIM & network
Enable or disable SIM card -  Choose a  SIM card
Enable or disable SIM card -  Enable or disable the  SIM card
Enable or disable SIM card -  Confirm with  OK
  1. Open the Settings
  2. Tap on Wi-Fi & network
  3. Tap on SIM & network
  4. Choose a SIM card
  5. Enable or disable the SIM card
  6. Confirm with OK

OnePlus Instructions
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