To switch between open applications, press and hold the menu key.
Leaving applications running in the background increases the demand on battery power and reduces the battery life.
To change the profile, press the power key, and select a profile.
To call your voice mailbox (network service), in the dialer, tap and hold 1.
To open a list of last dialed numbers, in the home screen, press the call key.
To use voice commands, in the home screen, press and hold the call key.