Getting started
Basic use
Calls and contacts
Messaging
Apps and media
Connectivity
Specifications
Cause 1 of 9: Your phone is overloaded for unknown reasons
If your phone is overloaded, you can't make any calls. It may help restarting it.
Solution: Restart your phone.
Restart your phone
Press and hold the Home key.
At the same time, press and hold On/Off until your phone restarts.
Or choose...