If we are not in our home country with the Oppo smartphone, the roaming assistant will automatically add the country code to a phone number.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Phone -App
Step 2:  Open the  Menu
Step 3:  Open the  Settings
Step 4:  Tap on  Roaming Assistant
Step 5:  Enable or Disable  Roaming Assistant
  1. Open the Phone-App
  2. Open the Menu
  3. Open the Settings
  4. Tap on Roaming Assistant
  5. Enable or Disable Roaming Assistant

Oppo Instructions
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