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If a call is being made on the Oppo smartphone, we can use the "Call waiting" function to inform us when another call comes in.

Call waiting is already activated depending on the network operator, but in any case, call waiting can be activated or deactivated in the phone settings.

Android 11 | ColorOS 11.0 | Google Phone
Step 1: Tap on  Phone
Step 2: Open the  Menu
Step 3: Tap on  Settings
Step 4: Tap on  Calling accounts
Step 5: Tap on  Carrier call settings
Step 6: Tap on  Additional settings
Step 7: Choose a  SIM card   (Dual SIM)
Step 8: Enable or disable  Call waiting
  1. Tap on Phone
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Calling accounts
  5. Tap on Carrier call settings
  6. Tap on Additional settings
  7. Choose a SIM card (Dual SIM)
  8. Enable or disable Call waiting
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Oppo Instructions