zBoost TRIO SOHO - Tri-band AT&T 4G cell phone signal booster up to 2500 sq. ft. zBoost TRIO SOHO cell phone signal booster boosts indoor signal for voice and AT&T 4G data signals up to 2500 sq. ft. The innovative zBoost TRIO SOHO boosts AT&T 4G LTE CEL (800 MHz) and PCS (1900 MHz). zBoost TRIO SOHO captures the reliable cellular signal you have outdoors and rebroadcasts it indoors so you can enjoy clearer faster and more reliable service without interruption.