One pretty glaring flaw we noticed in our HTC Thunderbolt review was the lack of any 3G/4G switch. Such a switch is a vital asset for times when battery life needs to be favored over data throughput. But alas, the old Android test menu saves the day again. Simply dial *#*#4636#*#* to access this hidden test menu where you’ll find among other things, the 3G/4G switch in all its glory. On the Thunderbolt, you have three options: LTE only, EV-DO only, and LTE+EV-DO. It’s not the most user friendly solution (and we certainly hope HTC issues a patch to change the situation) though it’s better than nothing at all we guess.
Source: Android Central
Via: Engadget Mobile
