When it's using Skype! While it's not the standalone Skype client a lot of people are hoping turns up for the Wi-Fi enabled N91, Useful Skype Phone allows you to use a small number of Series 60 handsets (the 6630, 6680 and 6681) as a Skype handset. The secret sauce is in a bluetooth based server on your PC, so you'll still need to be close to your desktop, but it could be a lot more comfortable than some dodgy music speakers and flakey microphone.