So I got a quite annoying problem and I already spent quite some time searching the forums and google without results. Either the solutioins didn't work or the cases I found were unsolved.
Anyway, here is the story.
I have a xperia tipo (st21i) and I rooted it and unlocked the bootloader and flashed several kernels and roms to find the one I'm most comfortable with.
I used: CM 10.0, paranoid android, super jelly bean and performa v4 in case this is of any interest.
I decided to go with cm 10.0 and it worked fine until after one reboot suddenly my SIM card was unrecognized and it said I should restart the phone with a valid SIM card. I flashed different ROM's and went back to stock now but the problem persists. I really ran out of ideas and since I'm not really skilled and rich of knowledge beyond the point of flashing and the rough structure of android I'm a bit helpless here.
Any help is really appreciated and thanks in advance
P.S.: first post