So when I got my nexus today I look down and was admiring my 4g icon when i was walking out of the store. Got in my car pulled and and viola! back to 3G and havent seen the 4G icon since. I know i should be within range. I live about 5 miles outside of Flint MI and they got 4G back in may or june? This is my first 4G phone as Im coming from the DX. Am I missing something?