i live in salt lake. i bought my phone in reno. but didn't put it to use untill i got home 5 days later.
which means the phone was never touched. no apps loaded or anything for the phone to be using data.
in reno the signal was 4g blue. but out of reno it went to 3g blue. some spots had 3white. and there were some dead spots. i was on my way home just passing through on my way to vegas. THEN coming home.
i don't think data being used has anything to do with the color. i had areas of blue. and areas of white. and areas of nothing. 5 days later. i am home now, had my number ported to the phone and NOW it's being used. the phone was activated in reno with a reno area code phone number. but never touched. not one thing was setup on the phone yet. it was strictly in activated mode. not even a phone call was made.
the only i DID do. was check out the internet capabilities while it was white and things worked just fine.