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 10 (ColorOS 7.0)
Step 1:  Open the  Phone -App
Step 2:  Open the  Menu
Step 3:  Tap on  Settings
Step 4:  Tap on  Carrier call Settings
Step 5:  Tap on  Additional settings
Step 6:  Choose  SIM-Card  you want
Step 7:  Enable or Disable  Call Waiting
  1. Open the Phone-App
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Carrier call Settings
  5. Tap on Additional settings
  6. Choose SIM-Card you want
  7. Enable or Disable Call Waiting

Oppo Instructions
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