FAIRPHONE Fairphone 4
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 3
Remove the battery and leave it out for 10-15 seconds.
Step 2 of 3
Insert the battery and turn on your phone again.
Step 3 of 3
See how to change the battery and turn on your phone.