Product features: the Sure Call flare 3.0 Cell Phone signal amplifier boosts weak signal up to 3, 000 sq. ft. in an omnidirectional pattern. This results in fewer dropped calls, improved battery life, higher audio quality, and faster data and streaming. Sure Call cell phone signal boosters are compatible with all North American carriers including: AT&T, T-Mobile, Verizon, Sprint, Straight Talk, U.S. Cellular and many more.