Mine switches a lot at home, but does stay on 4g quite a bit. I get mostly 4g when I am at work.
It does switch much faster than the Samsung galaxy Siii (which really annoyed me... "oh, look... 4g... Lets switch to that... Just give me a minute here...") and the battery life is amazing in comparison. The radio on this phone is simply amazing.
Sent from my DROID RAZR HD using Android Central Forums