We live out in the country, in a metal sided mobile home.  The verizon phone seems to stay at 2 bars, US Cellular stays at 3 bars(even though it has the closest tower to us) AT&T and T Mobile fluctuate between "no service" up to brief moments of 2 bars.  It took my husband less then 30 minutes to install and hook this thing up.  My AT&T phone immediately went all the way to 5 bars.  Back in the bedroom and bathroom it drops to only 2 bars, still better then the 0 bars it did have.