In my house there is only 0-2 bars of 4G LTE while constantly having full bars on 3G/4G HSPA. So I was thinking maybe I can get a better/faster data connection by disabling 4G LTE so that my cellular data could camp on the stronger 3G/4G HSPA signal. But it is not so straight forward on an AT&T Lumia 920. Apparently that option is disabled in the Cellular setting (strangely iPhone 5 has that option). So after a couple of hours' research on the web, I have succeeded in "forcing" it onto the 3G/4G HSPA connection and disabling the 4G LTE connection. For anyone interested to give it a try, here are the steps:
1) Dial ##3282# to get into Field Test mode
2) Once in, go to Settings menu by tapping on the 3 little dots in the bottom right corner
3) Choose "3G only" in the Network Type field and "automatic" in the UMTS band field
4) Turn "Toggle ENS (reboot required)" option Off
5) Power off your device by pressing the Power On/Off hardware button
6) Turn on your device again and you will see only "4G" displayed on the top of your screen without "LTE".
1) Dial ##3282# to get into Field Test mode
2) Once in, go to Settings menu by tapping on the 3 little dots in the bottom right corner
3) Choose "3G only" in the Network Type field and "automatic" in the UMTS band field
4) Turn "Toggle ENS (reboot required)" option Off
5) Power off your device by pressing the Power On/Off hardware button
6) Turn on your device again and you will see only "4G" displayed on the top of your screen without "LTE".