You can control many of the phone functions with your voice. You can call contacts from the address book, dictate messages and search the internet. Before you can use voice control, you need to set up your mobile phone for internet and turn on Siri.
Tap and hold the Home key until a tone sounds.
Say, in your own words, what you would like your mobile phone to do, e.g.: CAMERA, CALL [contact], SEARCH THE WEB FOR [information].
If an application is open on your mobile phone, such as Mail, you can also use the functions available here, e.g.: REPLY [text].