Weird. Every network is AT&T.
I have an iPhone activated with AT&T. I already configured Visual Voicemail, recorded message, etc.
However, it is important for me to use it in México, so I get AT&T when I am in the US and my local carrier when in México.
I unlocked using iBrikr and AnySim, it was ok, just that the unlock commands failed, however, it is working with my carrier.
When I insert my local, or any local sim, I do not get my local carrier to display, (movistar),
I just get AT&T, I can make calls, send messages but that looks weird.