I found this to do exactly what it is supposed to do: boost your signal, not give you signal where there is none. In most cases, Ifound this boosted my speed and signal. You can't rely on bars, alone and it helps to turn your phone to airplane mode and then turn off airplane mode to force it to look for the signal and refresh your "bars." A speedtest is the best way todetermine if thebooster is helping, or not. Antenna type and placement are also keys to successfully using this device. Make sure you do some reading if you want to get the most out of the device.