The back, start, and search keys help you navigate your phone.
To see which apps you have open, press and hold . You can then switch to another app or close the ones you don’t need.
To go back to the previous screen you were in, press . Your phone remembers all the apps and websites you've visited since the last time your screen was locked.
To go to the start screen, press . The app you were in stays open in the background.
To search the web or for items on your phone, press .
To control your phone with your voice, press and hold , and say a voice command.
This feature is not available in all languages. For info on the supported languages, go to www.windowsphone.com.