Mobile network problem topic

Hi everyone, after flash Beanstalk with iodak v9.5 i don't have signal from mobile network(cosmote) i think my sim is demagnetizated, in my country this problem is frequently. But i'm not very sure this is real cause... I use clean install(wipe data,cache, dalvik) i use latest version of cwm. Now i have instaled latest nightly version of cyanogenmod. I try with any roms but still have problems. I don't have backup of stock rom. Please help me, sorry for my bad english but is not my principal language. Thank you very much.

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