It's called "magicjack" and what it is, is a thing that looks like a
flash drive. You plug it into your usb port, plug your phone wire in
the back, and you've got unlimited local and long distance --and your
own telephone number in your area code.
I've had mine a week and the calls are flawless.
Here's a forum where people are talking about it:
you have to pay for the device, then you pay an annual fee.
How is that basically free ?