Apple iPhone 4S

Apple iPhone 4S

I can't make voice calls on my Apple iPhone 4S iOS 9.0

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 and hold the Home key.

Step 2 of 2

Restart your phone

At the same time, press and hold On/Off until your phone is restarted.

1 Restart your phone

Press and hold the Home key.
At the same time, press and hold On/Off until your phone is restarted.

Did this solve the problem?

Yes - All solved No - Go to next cause