Mingcoll at&T Cell Phone Signal Booster 700MHz Band 12/17 Cell Signal Amplifier FDD 4G LTE ATT T-Mobile Mobile Signal Repeater Booster for Home and Office (BA70-9ZT) Work with ATT: The cell phone booster could work with ATT/T-Mobile 4G Lte Band 12/17 network frequency, Uplink:698MHz-716MHz,Downlink:728MHz-746MHz. Boost the Signal: The signal booster could amplify your existing signal to give you more bars, and then you can experience much faster high-speed 4G LTE internet. Perfect for people needing fast uploads and downloads for streaming apps such as Google, YouTube. Improve Call Quality: The signal booster will improve call quality and maintain a better voice environment. Its coverage can be up to 1500-2000 sq.ft in your house, office, villa, garage, basement and so on. No more dropped calls, faster data speeds. Easy Installation: The package will contain all of the components you need for installation with step-by-step instructions. Requires no technical experience, plug and play, easy and convenient to install. Product Warranty: 30 days money-back guarantee, one-year manufacturer warranty, and with FCC authentication certificate. If any matter, please feel free to contact us, were always at your service!