I jailbroken and unlocked my iphone 3gs running on 3.1.2 using it with T-mobile, but can't receive calls while on standby. It doesn't show any miss calls. I tried to call myself 10 minutes after the phone went on standby, and it directly forwarded the call to voicemail. Please help!! I don't have any problem making calls, but just can't receive them. Please advise on what to do!! Is there a code on cydia THAT CAN resolve this problem? Does anyone else have the same problem?