OPPO Find N2 Flip
It's not possible to make voice calls
Solution 3 of 11: Your phone is overloaded for unknown reasons
If your phone is slow or freezes, it might help to restart it.
Step 1 of 2
Press the Side key.
Step 2 of 2
Simultaneously, press and hold the upper part of the Volume key and keep them both pressed until your phone restarts.