AT&T offers microcell activation and sales. Microcell devices may be purchased directly from AT&T, or they may be purchased from a third party retailer and then registered at an AT&T store.
A microcell is a small device that acts as a local cellphone tower to help boost cellphone reception in the immediate area. It connects to the Internet and requires a high speed connection to function properly. Once connected, phones near the microcell connect to it, and data is transmitted through the Internet via the microcell. This device provides needed service in regions or buildings where cellular coverage is unreliable, but high-speed Internet is readily available.