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If they are blue you are connected to Google, white is just Verizon. As long as there is a 4g Lte or 3g symbol then there is a data connection
When my 4Glte and bars are white all apps report "no connection." When it comes back to blue, data can flow again.
More here:
http://androidforums.com/motorola-d...ta-connection-drops-all-time-anyone-else.html

My Background Data has been off, and the signal bars were white. I just turned Background Data on, and now they are blue. Turned off again and bars are white again.
As carracerz14 stated, connected to google=blue, verizon only=white

I feel dumb for asking this, but I will anyway.
What is it that we connect "to" Google for? Doesn't Verizon provide our data access?