HTC One A9

Android 6.0

I can't make voice calls on my HTC One A9 Android 6.0

Cause 1 of 4: 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 part of the Volume key until your phone is restarted.

Press and hold On/Off.

Simultaneously, press and hold the top part of the Volume key until your phone is restarted.