I don't have it but based on the specs, it should work with att lte
Is there any data on that carrier aggregation options the 7x will support?Yes, it should... according to phonescoop.com, the 7X provides access to bands 2, 4, 5 and 12, which are AT&T's basic LTE bands.
Is there any data on that carrier aggregation options the 7x will support?
Most definitely. Carrier aggregation, qam 256 and MIMO 4x4 are pretty important when you are in a marginal areaNot that I’ve seen. It would be surprising to find that in a budget handset, but I have a feeling we’re getting closer as the distinction between top- and mid-range phones continues to fade.