So, everything else works, I can send and receive texts, I can even receive calls, but I'm not able to make calls, it doesn't even try to connect, it immediately shows the message "Call failed". I've not got the phone wet any how.
I am running the 7.1 leak. I've not tried wiping the phone or anything of such yet. I have performed a battery pull, however. I've tried turning the Wi-Fi off, changed to 3G only, 2G only and even turning off Data services, but no luck.
Is there anyone who can direct me to the solution or give me suggestions? Any help will be much appreciated.
All I'd recommend is try to move to a different location where you are covered by a different tower, then see if it's just the tower. Also if you can get ahold of anyone else's phone on O2 see if their's works. It could be the tower. Just a suggestion.