An Internet VPN provides a tunnel between your device (cell phone) and the Internet. This allows you to surf securely and privately in a public WLAN, for example. Using a VPN is a good first step to protect your privacy. Learn more at Self-Defense BaseCamp.
VPN simply explained
VPNs are sand in the gears of Internet corporations. Here you can find questions and answers to common problems with the daily use of a VPN service.