I had no problems setting it up with Att prepaid, I simply called the att gophone line then the automated system asks for a phone number or to activate, I simply said activate. Then when it asks say your activating a phone. The rep will ask you for the icc Id which is the sim # then the imei. They will stall you for a few minutes because they are running an error most likely. However after a few minutes they will tell you to tell the phone on and then you need to go into settings and turn mobile network always on so it can connect. Once completed you are all set up. They offer 30 unlimited texts and calls and then a 45 or 60 plan with 4 or 8gb of data