From The Register IPdrum plugs mobile phones into Skype
Norwegian company IPdrum yesterday launched a system that connects the Skype VoIP network to mobile phones
IPdrum's Mobile Skype Cable requires two handsets, one which connects to a host PC's USB and audio ports using the aforementioned cable, and the other to make and take calls from wherever you happen to be at the time.
The first handset bridges Skype and the mobile network. Skype operates, as usual, across the host computer's broadband Internet connection.
To make a call, you dial the number of the stationary handset, and IPdrum's code patches the call through to Skype. Calls to other Skype users are free, but conversations to others are charged according to the VoIP company's current SkypeOut rate