For some reason, both the Vapor Comp and Vapor Pro IMPROVES my iPhone 4's reception. My averages in field test mode, all at roughly the same position on a stand (ie. NOT held in hand):
Vapor Comp: -57.5
Vapor Pro: -55
BARE, no case: -65
Blade: -75
Variables: roughly the same spot on a stand, but can't say EXACTLY. Also, different days, but I took the average.
weird.
lol, it doesn't improve it.
The signal on your phone fluctuates a lot more than you think, but the field test numbers don't update super fast.
The signal is almost always going up and down.
Pretty much, the vapor pro and comp have NO effect on any of the signal whatsoever.