iPhone 5 calls go straight to voice mail
This happens sometime, not always.
The caller heard one rang then the call went direct to voice mail.
I was in the full bar services area and can still receive email and IM via LTE, but I did not see any missed call notification nor incoming calls.
This happenes to my AT&T iPhone 5.
The Do Not Disturb and Airplane Mode are both off
How can I fix this?
iPhone 5, iOS 6