I've tried a few different things, I've tried the stick on "boosters" and external antenna's. The boosters don't work, they are just a gimmick, the external antennas do work however DO NOT use them as they may cause cell reception without them to be nearly impossible since the phones aren't designed for the interference it hears with an external antenna. The only thing I've read that actually does work are repeaters, which can be used in your car or home.