Hi I resetted my iphone 3g - 8GB using the "Erase all data and Settings" which removed the OS and all software from iphone. Now when i want to restore the iphone through itune, i dont have the backup of the iphone. But my friends are having the iphone 3g/3gs. is it possible for me to take a backup of their phone ant restore it to my phone? When i connect my iphone to itune it is detecting the phone but display the message as "No SIMcard is valid" It is Jailbroken.