OPPO R9s

Android 6.0.1

I can't make voice calls on my OPPO R9s Android 6.0.1

Cause 1 of 3: There's a connection error

If your phone doesn't receive any calls when someone calls you, it may be caused by an unknown connection error.

Step 1 of 2

Restart your phone

Press and hold On/Off.

Step 2 of 2

Restart your phone

Simultaneously, press and hold the Top volume key until your phone restarts.

Press and hold On/Off.

Simultaneously, press and hold the Top volume key until your phone restarts.

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