A free program for Android, by T-Mobile USA.

Secure Wi-Fi for Mobile devices is a data security application that will protect you from malicious attacks and unwanted data sharing. Using this app, you will have full Wi-Fi security and privacy, even if you are connected to an open network. It uses a SmartVPN, which is a high-quality, easy-to-use, and secure VPN proxy service, to encrypt all the traffic sent through the Internet.

This application works automatically, and it works on both Android and iPhone devices. It is compatible with all Wi-Fi networks, regardless of the service provider. It will protect your device from hackers and malicious users. It is designed to work with Wi-Fi, not the cellular network.