YellowSn0w in Iran
It is working now!!!!
please update your yellowsn0w to 0.9.4
but my bars disapear when I want to make outgoing calls.
Toggling airplane mode will restore signal bars. Incoming calls work perfect.
Outgoing call: NOT OK(signal goes)
Incoming call: OK
SMS IN/OUT: OK
I got another sim card from my carrier.(new sim card)
It work perfectly, All calls(In/Out) works. when I replaced the new sim with the other sim(old sim) outgoing calls dosn't work.
It seems there is problem with old sim cards.
Seccessfully resolved with 0.9.5