So you are busy and your phone rings. In previous versions of Android you could slide the slider to the right and answer the call, or slide it to the left and route the call to voicemail.
Ice Cream Sandwich allows you to go one stage further with the call rejection, slide the slider up and you get a txt icon:

Releasing the slider over this icon then gives the option to send 1 of a set number of pre-defined messages, or you can send a customised message:

Clicking on one of the pre-defined messages will automatically send that message to the called number and send the call to voicemail.
The customised message one, lets you type in a txt before sending it to the called number.
Now you can quickly give the called number, some information on your status rather than just blindly transferring the call to voicemail!
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