Even if I have it set on to Data Roam, every once in a while, it seems to uncheck itself. How do I know this, there's a certain section in the building I work where I usually always roam on Verizon (voice and data, no problem) and previous phones I've had (Note 2 and iPhone 5s) would roam just fine.
With the G2, I'll notice that a triangle pops up in the top left telling me that I've lost data connection because I have Data Roaming turned off. Of course I set it to data roam.
Lo and behold I go into Settings and Data Roaming has turned itself off again, so I check the box to Data Roam and data starts flowing. It will stick for most of the day or two until I notice it again, and the cycle repeats itself.
It gets really frustrating if I don't notice this phantom behaviour because I could be in this particular location for quite sometime and not notice that I don't have data because it's unchecked itself, again.