HotSpot Shield: For Android and iOS - $0.99
Using unsecured Wi-Fi hotspots probably makes many mobile users uneasy. HotSpot Shield provides a VPN when connecting to any public or private hotspot. Hotspot Shield will make all Internet activity completely private by masking the real WAN IP of mobile devices.
The app simply runs once it's been launched. It also can increase browsing speed, which in turn can lower data usage, and also produces a report showing how much data usage it saves.