**********IMPROVE ALL US AND CANADIAN CARRIERS cell booster is compatible with all US and Canadian carriers including AT&T, T-Mobile, Verizon, Sprint, Straight Talk, U. S. Cellular and many more. The signal booster amplifies 4G LTE, 3G and 2G cell phone signal. *****App helps fine tune max power: Most cell phone booster has you pretty much working in the blind, no figures you can see but guess. App helps fine tune max power and see real-time data of what the signal booster is doing, and let you squeeze every last power from the cell booster. Even 1dB more power is precious when you suffer from no signals. Further APP online-support assures you get the absolute best possible set up and performance. *****SUPPORT ALL CELLULAR DEVICES signal booster boosts Voice, Text and data speed. Support cellular devices of smartphone, tablet, data card, Wi-Fi Hotspots and notebooks all at the same time*****UP TO 1, 000~4, 000 SQ FTThe coverage may vary between 1, 000~4, 000 sq ft due to outdoor signal