[toast0]

Does your phone do Voice over LTE and more importantly, does it do Voice over LTE on AT&Ts network? If AT&T won't provision it for VoLTE you may not be able to make voice calls once AT&T shuts down 3G.

[AnonymousOne]

I'm not sure about VoLTE.

Either way, I called AT&T and specifically confirmed with them that my phone will still work after the 3G shutdown.