Mobile 3G Signal Booster (Cellphone Signal Repeater, UMTS Mini Repeater). Mobile 3G Signal Booster (Cellphone Signal Repeater, UMTS Mini Repeater). Selling point of product: 1. 200-500 square meters ... can use directly. MINI 3G mobile phone signal amplifier, cell-phone repeater/booster, A mobile phone signal repeater provides the ultimate solution in any area ...