According to the spec on the AT&T website, the Padfone X should support LTE Band 4 (1700/2100) and from my research, my network is the same. However, when I take a look at mobile networks from "Settings > More... > Mobile Networks > Network Operators", my network doesn't appear in the list (though others do).
If I enter the service code "*#*#4636#*#*" to get to the service menu, I don't see any option to change the band. I do see an options to "Set preferred network type" (which I set to "LTE/GSM/CDMA auto (PRL)") but the result is the same in that my network does not appear.
Any ideas how I can check what band the Padfone X operates on (or how to change it)?
Note: I've rooted the device, so I can poke around in the terminal, I just don't know where to look :/