An upgrade of their FlashPhone Mplat F2K, the FlashPhone Mplat F4K carries Skype and SIP phone software in its 128MB flash memory. How it works: plug this into a PC, say your own PC or one at an internet cafe, then launch the Skype software and hook up your bluetooth headset. Then, the FlashPhone is ready to make calls while keeping all the call history and login information on the disk, so that your call logs aren't exposed onto the computer you're using.
This version has Bluetooth support so you can use your Bluetooth headset to talk. And it looks a lot like the iPod shuffle, including the lack of display, so you can fool your grandma.
Product Page [Mplat]
Flashphone MPlat F4K [uber gizmo]