OPPO A16s

OPPO A16s

Android 11.0

I can't make voice calls on my OPPO A16s Android 11.0

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.

Solution: Restart your phone.

Step 1 of 2

Restart your phone

Press On/Off.

Step 2 of 2

Restart your phone

Simultaneously, press and hold the Top volume key and keep them both pressed until your phone restarts.

1 Restart your phone

Press On/Off.
Simultaneously, press and hold the Top volume key and keep them both pressed until your phone restarts.

Did this solve the problem?

Yes - All solved No - Go to next cause

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