hi i have iphone 16gb 2g i am using it on 2.0.1 i upgraded it to 2.0,2 and now it says no service i have tried it to 1.1.4 , 2.0 2.0.1 2.0.2 2.1 but none of those or working it drops connection and says no services i am sick of it can any body heklp me out