Source:Use your computer as a phone for free
I recently discovered a really cool feature in Vista (I think it isn't available quite so readily in XP), which allows you to transform your computer into a phone really easily. Of course you'll need a bluetooth capable mobile, and a bluetooth capable computer (or an adapter), but once you hook the two together you can import, export, sync and make calls without any external software. Take a look at my screenshot tour of how to do this, basically I am making my laptop a mirror of my phone contacts and using it as a headset for the phone.
I recently discovered a really cool feature in Vista (I think it isn't available quite so readily in XP), which allows you to transform your computer into a phone really easily. Of course you'll need a bluetooth capable mobile, and a bluetooth capable computer (or an adapter), but once you hook the two together you can import, export, sync and make calls without any external software. Take a look at my screenshot tour of how to do this, basically I am making my laptop a mirror of my phone contacts and using it as a headset for the phone.