When configured, the software will read the subject line of an email sent by certain specified contacts into your ear.

ENGADGET: Plantronics Voyager PRO UC senses your Bluetooth wants and needs, softly whispers in your ear

Mr. COLEMAN: (Rapping) From mic to cassette, deep into your ear, my voice is your choice that you wanted to hear.

NPR: Cowboy Troy and 'Hick-Hop'

You slide a personal listening device into your ear, press a button, and it expands and locks into the ear canal.

FORBES: Deaf People Will Hear

While wireless headset manufacturers battle one another to shrink their wares until they completely disappear into your ear canal, organizers of the Switched-On London lighting festival (not named, unfortunately, after the excellent column by NPD's Ross Rubin) have taken the opposite tack: for one week in February, they've transformed the famous Tower Bridge into the world's largest Bluetooth device (narrowly edging out the PS3).

ENGADGET: This week only, London's Tower Bridge is the world's largest Bluetooth device

It can be fooled into thinking it's against your ear (and therefore fooled into turning off the display) simply by holding your hand near the top of the phone, but no real surprise there.

ENGADGET: We've got iPhones, what do you want to know?