UNITED STATES

Different models work at different frequency bands used by operators in the US which explains why some boosters improve only GSM or 4G signal, while others are able to deal with all the possible issues at the same time... A cell signal booster does not produce a new signal, it works with the signal that is transmitted by your carrier. But antennas of signal repeaters are much more sensitive than those of smartphones. As a result, top-notch 4G, 3G, GSM boosters are able to catch the signal even in those cases when your smartphone simply can't receive it... To better understand how boosters work, we should have a closer look at their configuration.