Personal Home Support Centre Device Guides OPPO R15 Pro Calls & contacts I can't make voice calls

OPPO R15 Pro

Android 8.1
Back to section Calls & contacts

I can't make voice calls

There's no credit on your prepaid phone
Your number is no longer in service
Flight mode is turned on
Barring of outgoing calls is turned on
Your phone is overloaded for unknown reasons
The SIM is faulty
Not adequate network coverage
There is a temporary network problem
There's an error at the receiving end
The selected network is out of range
The selected network mode is not available

Select network mode

Press Settings.
Press Dual SIM & Mobile.
Press the required SIM.
Press Preferred network type.
Press the required network mode.
Press the Home key to return to the home screen.
  • 1
    Find "Preferred network type"
    • Press Settings.
    • Press Dual SIM & Mobile.
    • Press the required SIM.
    • Press Preferred network type.
  • 2
    Select network mode
    • Press the required network mode.
      There may be different network modes available depending on where you are. If you set your phone to the fastest network mode, it will always find the network with the highest data speed and best signal.
  • 3
    Return to the home screen
    • Press the Home key to return to the home screen.

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Roaming isn't activated on your service