Your phone constantly connects to cell towers which provide you with making calls or sending/recieving SMS. This app uses cell tower ID, not GPS to find out where the user enable his/her device's wifi.

Why should I install this app? 

- Save battery. By disabling Wi-Fi when you are not actually in a place you use it, you prevent your phone from constantly trying to connect to networks you're nowhere near.

- Security. Connecting to Open networks puts your privacy in real danger. A hacker can easily access to your information, your photos, contacts and even your password through these networks.