Solution:

Common APN's for AT&T 3G Service: "wap.cingular", isp.cingular" LTE Service: "broadband", "phone", "pta" We recommend to leave all the other settings at the top blank. For 3G service you will still need to change the Carrier drop down menu to AT&T. If you have a Public Static IP address it is most common to use APN: "i2gold". Sometimes a username and password is required. This should be obtained from your provider. Other providers that use the AT&T network(MVNO's) will have their own private APN's that will need to be obtained from that provider.