Prior to installing the signal booster 12 feet up on the side of the house, under the eves, I had 1-2 bars with our AT&T phones and zero bars with my company phone (Verizon) inside the house.  The signal where I put up the outside antenna was 2 bars with the Verizon phone. We live approx. 3 miles from a tower and we have hills between us and the tower.