Skype allows you to make phone calls anywhere in the world from your PC for about 2 cents an minute. You can receive calls too, plus there’s voicemail and file transfer. Calls can be made to/from a Skype number or a regular phone number.
All you need is a headset (mine was $20 at Radio Shack) and you’re set to go.
If you have Skype, I’m polizerosbob.