I sent in my iphone for repair and I didn't get the email about removing the sim card (I didn't know the iphones used sim cards...yeah I know dumb me.) and I no longer have my at&t service. I have just been using the phone as a ipod and connecting it 2 my wireless net at home, work, & school. The new one came back and it didn't have my sim card in it and the repair guy didn't tell me 2 take it out so it got shipped with the sim card. How would I go about getting a sim card? can I buy a prepaid at&t phone and use it's sim card or do I just need 2 contact at&t to see if that will work.