at&t microcell wireless 3g cell signal booster tower antenna cisco designed this at&t microcell is built by cisco systems, a leader in cellular network technology. it can provide up to 5 bars of at&t cell signal to your 3g and 4g mobile phones (including iphone, android, and windows mobile). setup is quick and easy - just follow the included "quick-start" guide and it will be up and running typically within 2 hours of setup. note that this device requires internet connectivity through a wired ethernet connection (cable is included). most wired and wireless routers include 4 or more of these ports. also requires installation close enough to a window to receive gps signals for use during emergency (911) calls.