AT&T T-Mobile Cell Phone Signal Booster 4G LTE Band12/17 Cell Phone Signal Amplifier AT T Cell Phone Booster for Home SHWCELL Mobile Signal Repeater (Main Body for AT&T) This cell phone signal booster is designed for 4G LTE Band12/17 AT&T 700mhz cellular band Support any phones in the frequency range : Downlink : 746--757 MHz Uplink :698-716 MHz. Supports voice and 4G data for 4G/LTE mobile phones, including IOS , Android, it can receive the signal from the signal tower ,and then amplifier your mobile signal, The cell phone signal booster repeater is used for Village,Garage,Basement,Home,Office , hotel, apartment and so on Better voice quality, faster Data uploads and downloads,Get fewer Missed calls FCC authentication certificated ,solve your bad mobile network signal and enjoy your Nice time