While Orbot creates the connection to Tor, Orweb is what actually lets you use it to surf the web. Last up we have the companion browser the developers over at the the Guardian Project created for Orbot, called Orweb. If at any time you want to change your Tor Identity to a different IP address, you can swipe across the main screen, which will come in handy if you don't want to stray on the same IP address for too long.
The first time you open the app, you'll have to complete the set-up wizard, but afterwards, all you have to do is long-press the Power button in the center to activate Orbot.