Originally Posted by Allen_B
For the AT&T version, no such option under the Mobile Data menu. Only options are "Data Roaming" Access Point Names" and "Network Operators"
I get what you are pointing toward, but that is the source of my frustration. I can't seem to find anyplace to turn off or opt out of 4G/LTE on an AT&T phone...
Unfortunately, you're not going to.
AT&T pulled this same stunt last year on the HTC One X.
With that, the only option was to create a new APN. That would turn off 4G services - but leave the LTE radio powered up.
And even that - I think - got killed by an update to that model.
There's a service/test code setting outside of the normal menus that will let you get to the option - except on an ATT model, you can't make the setting stick even when you can see it.
The only solution that I think you'll really find is to find a rom with a 4G toggle appropriate to the ATT model, root and apply that.