From this you can easily give the phone a number of vocal commands, for example you can make a call or "write" a text by telling your phone what to do. You can also make the phone "talk" to you by turning on "Driving mode".
When "Driving mode" has been turned on you will see a green light underneath the car (like in the picture on the right of this page). After pressing on "Driving mode" you will notified by a computerised female voice of things like texts and phones calls.
To turn these vocalised alerts off you merely need to open the "Voice talk" screen (the one in the screen captures) and turn off driving mode by pressing the icon again. Obviously we advise using the "Driving mode" option if you're driving rather than physically looking at your phone (which we do not advocate) though of course if the phone is just sat in your pocket you really won't need driving mode to be activated.