the iphone i bought from a friend wont let me reactivate it after i restored it. it says i need a sim card but i dont want to set up a service plan i just want to use it as an ipod touch...i just wanted to update the software. can i use any sim card?
You can not activate any GSM iPhone without a SIM. That's the way it's always been. The SIM does not have to be tied to active service, but it must be present and if the phone is carrier locked, it must be from the correct carrier.