Guys I need your help I bought an Iphone from ebay, as per the seller, the phone is offficially unlocked by apple (model# MB489X). when I recieved the phone I've inserted my SIM card and it worked and detected the network....the FW was 2.0. later I was trying to upgrade to 2.2 and then JB it, after the upgrade the phone failed to activate by Itunes. it says insert a valid sim card. right now, the phone is displaying the USB cable and the Itunes logo. 1) what is the possibility of this phone being turbosim soldered? 2) what shall I do now to get it working? any advice? Thanks in advance.