I don't know what service provider you are using, but if you try and use your SIM card on another phone and it dosen't work, then change your SIM card from your service provider. If it does, then maybe there are some settings on your iPhone that will stop transmission from your service provider. Check if your wireless is enabled. Hope this helps!
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turbosim might be your answer! i bought an otb 1.1.2 iphone, jailbroke it and everything except the phone side worked, to get the phone side working, i had to buy a "turbosim" and everything is alright in the world again. ........hope this helps.
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