Red Pocket Mobile Sim Card No Contract, No Credit Check, No Hodden Fee Works on AT&T network. So, if you have AT&T in your area then this service is for you Prepaid - meaning no annual contracts, no credit check, no hidden fees SIM card will work with any GSM AT&T or Unlocked phone. And yes, you can use it with your AT&T iPhone - no need to unlock it Transfer your existing cell phone number to a new SIM card or you can get a new local number.