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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 when calling.

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  Assisted dialing
Step 5: Enable or disable  Assisted dialing
  1. Tap on Phone
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Assisted dialing
  5. Enable or disable Assisted dialing
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Oppo Instructions