3g or 4g signal at top right gets clear or white when phone not in use, on idle?

[305rev305]

What I've noticed is that while the battery on the top right stays blue, the 3g or 4g signal sometimes goes white or clear like if the signal drops but I can still use the phone... then after a few seconds it goes back to blue. Maybe it goes white or clear when phone is not in use while on idle? Can someone confirm this? Have you seen this happen?

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