AT&T SIM Card, Compatible with Prepaid (GoPhone) and Postpaid AT&T Cellular Service (Micro) Compatible with both AT&T Postpaid (yearly contract) and AT&T Prepaid (GoPhone, no-contract) AT&T Service "Micro" sized SIM card - compatible with iPhone 4, 4s, Galaxy S2, S3, S4. Not compatible with many newer phones May include SIM card eject tool No minutes nor cellular service included Compatible with certain AT&T or unlocked phones. Contact seller before purchasing if you are unsure if this is the correct size SIM card for your phone.