Signal Guard Free is a free utility and tool application for Android developed by kevin.zhang. It provides real-time monitoring of the signal quality and working condition of your cellphone, giving you a beforehand warning with ring, vibration, and LED three methods when signal abnormalities occur, such as entering places like subway, basement, computer room, and tunnels or caused by uncorrectly baseband settings. It can automatically restore signal networking within 6 seconds, in accordance with the signal parameter settings. The whole restore process will be recorded in a database that could be checked later.

Signal Guard Free has several features that can enhance signal stability and improve the quality of the connection. These features include baseband locking function, cell tower locking function, WIFI management function, WIFI channel diagnostics function, and power-saving function. It also supports monitoring and restoring the signal even when the cellphone is in standby or hibernation mode. With a 4.27-star rating and more than 100,000 downloads, Signal Guard Free is a reliable solution to the problem of losing signal or offnet frequently on your Android cellphone.