Anything below -110dBm is definitely weak, and you might not hold onto any signal below -120dBm. A number higher than about -90dBm (like -80 or -70) is a strong signal. Whereas your phone shows bars, wireless industry folks measure signal in -dBm. Do Cell Phone Boosters Really Work?īoosters help the most when you have a weak signal, not when there's none at all. Cheaper boosters available from Amazon often aren't FCC-certified, which means they can cause trouble with surrounding cell sites and networks. That's why you need to stick with boosters primarily from the big four companies: Cel-Fi, HiBoost, SureCall, and weBoost (we also include one from Wilson for a special use case you can read about below). What Are the Best Cell Phone Booster Brands?īooster manufacturers have to use various tricks to detect the best signal from surrounding towers and then amplify the signal without messing up the carriers' systems.
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