I have an iPhone 4 (4.2.1) and about once every two or three days when I try to call it just doesn't let me call and says: Call Failed instantly.
I've tried
Turning WiFi off
3G on and off
Turning Airplane mode on and off
Setting Date and Time manually
Restoring it
Resetting network settings
Some of these are just a temporary fix, but none permanent and now none work.
Any clues? Thanks
I've tried
Turning WiFi off
3G on and off
Turning Airplane mode on and off
Setting Date and Time manually
Restoring it
Resetting network settings
Some of these are just a temporary fix, but none permanent and now none work.
Any clues? Thanks