A:Answer I couldn't get mine to work on AT&T.
I took it to a corporate AT&T store, not just a franchise, and they couldn't get it to work either. The phone would send and receive text messages but could not make or receive phone calls. The same SIM worked just fine in other phones, so it's not the SIM.
Also, I can't I get this phone to work in Africa (Congo and Burundi) on their GSM Networks.