A cell phone signal booster (also known as a cell signal booster) is just what it sounds like; a device that boosts weak cellular signals for use by cell phones, smartphones, tablets, hotspots, and other cellular-connected devices. By amplifying the existing cell signal, cell phone boosters help: Reduce dropped calls.

Basically, signal boosters are legal devices that help improve call quality, weak cell signal, and provide faster data speeds. If you have usable signal outside your home, vehicle, or office building, but weak to no signal inside, then a cell booster will definitely improve your cell service and signal strength