Orbot is a free Android proxy app developed by the Tor Project that secures all browsing and mobile app traffic on your device.
Orbot uses Tor to encrypt your Internet traffic and then hides it by bouncing through a series of computers around the world. Tor is free software and an open network that helps you defend against a form of network surveillance that threatens personal freedom and privacy, confidential business activities and relationships, and state security known as traffic analysis. Orbot creates a truly private mobile internet connection.Tor Project
Unlike Tor itself, Orbot does have the ability for you to manually select the exit node country you want (just like a proxy or VPN) from a short but fairly well represented list.
In the very detailed settings menu, you have the option to enable Orbot to start automatically when you reboot your phone or table, as well as a sleep option when no internet traffic is detected. Another very important feature Orbot has, is the VPN function. When this is enabled, all internet traffic from the apps on your Android phone or tablet will be rerouted through the encrypted connection. This is especially useful when you need to use online banking while out and connected to a public wifi network or anywhere you can’t fully trust the hotspot or network you are using.