I own an Xperia J with an unlocked bl and have flashed many roms on it. Yesterday, the phone started to not want to connect to the internet (mobile data not WiFi) so I found this curious and rebooted the phone and tried re-downloading internet settings but nothing fixed it. I factory reset the ROM (not the phone) but now I couldn't even make calls/texts as the phone was stating 'Emergency Calls Only' and after going through the phones first boot setup, a window popped up saying the phone could not connect to the SIM. In the end, I changed roms (running Doomsday ROM at the time of the error's start) but still the same issue. Tried CM, same issue. Now on stock JB and the problem still consists. I can't really afford a new phone at the current time and my Z1 is being borrowed by my dad. Any help would be much appreciated.