Voice and Text Dual Band Cell Phone Signal Booster for Homes up to 6,000 sq ft. FlexPro is a dual band cell signal booster that increases voice and text signal strength for all North American cell carriers, including AT&T, Verizon, Sprint and T-Mobile. It reduces dropped & missed calls and extends battery life for multiple simultaneous users on all cellular networks. Dropped calls are history, as the FlexPro provides clear and consistent coverage for all 2G/3G cellular devices in a home or office, up to 6,000 sq ft.