Originally Posted by KOLIO
Go to SETTINGS > WIRELESS & NETWORKS > MOBILE DATA > NETWORK MODE & long press on NETWORK MODE.
You should now have the option of selecting which network mode works best for you.
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...