I just moved into a first floor condo in southern California. I realized that I was getting either no service or 1 bar of service for my iPhone (ATT). I was skeptical about this product (don't know why), but knew I had to try something. This product actually works. I seem to average between 2-3 bars of service, and people tell me I sound fine while talking to them. I also tried the indoor directional antenna upgrade, but wound up returning it, it didn't seem to improve the reception much at all. The installation wasn't too bad, but I did have to play with the location of the inside base unit a little to get the best coverage for all of the rooms.