I live in what’s called a “fringe coverage area” for AT&T. I get one or two bars on my iPhone 4 when I’m home. Calls sometimes drop, and callers often complain about the connection quality. Outside of moving or hoping AT&T builds a cell tower nearby, the best option to improve call quality is AT&T’s 3G MicroCell. Made by Cisco, the 3G MicroCell is a “femtocell”--a cellular base station that covers up to 5,000 square feet, according to AT&T. The device connects to your home broadband network, and it can tremendously improve cell phone reception in your house.