Mobile signal booster A mobile signal booster is a device that amplifies weak signals in order to improve cell phone reception. This can be especially useful in areas with poor network coverage, such as rural locations or inside buildings with thick walls that can block signals. By boosting the signal strength, users can enjoy clearer calls, faster data speeds, and better connectivity overall. Some signal boosters are designed for specific carriers, while others are universal and work with any network. Installation is typically quick and easy, making it a convenient solution for anyone experiencing signal issues.