Writing angry letters and throwing them away or burning them is more satisfying than destroying them digitally (that is, typing them on the computer and deleting them). There's something much more engaging about the physical connection to an object. That's why we'd rather slam down an old-style phone receiver to end a call in anger than push the "hang up" button on a mobile.
Mokalus of Borg
PS - Maybe they could build a mobile you can slam down to end calls.
PPS - Probably more of a concept art piece than a practical device.