I used to have AT&T service and was using my iPhone 4. I then decided the service was not worth it and cancelled after my contract expired. I removed the sim card and reset the iPhone because I originally planned on selling it on Ebay for a few bucks. Ironically my Zune (dont hate mac lovers lol) broke. I would now like to use my iphone4 as an alternative fancy ipod. however......its asking me to put a sim card in to activate it...and as I stated earlier - i threw that thing away . I dont want to use my old cell as a phone at all. I would like to just use it for music and take pictures on it. I tried looking up ways to do this -- but it seems complicated..like I would have to hack my own phone. Is there a sim card I could buy to just use my own phone this way?