Vktech CDMA 800MHz Repeater Booster Cell Phone Signal Amplifier with Antenna US Notes1:It could only strengthen cell phone signal, it could not produce cell phone signal,if there is no cell phone signal at all in your area, there is no need to use it. Notes2:Please confirm the Frequency Range of your cellphone carriers before buying. This repeater kit works with Verizon, At&T, Alltel, Cellular One, Roger, Bell and any wireless operator in the frequency range of 824-894 MHz, (850MHz) CDMA, GSM system in USA or Canada. Not Supports 1900MHz range in USA or Canada. This repeater kit also works with Telstra 800MHz Signal Network in Australia. Not Supports 900MHz GSM or 2100MHz 3G Frequency Range in Australia. This repeater kit only supports 800 MHz range. If your signal service is in other frequency range, it will not work for you. So please do not buy this item.