Originally Posted by TheByteKnight
There is an even easier way to do it. Just create a gmail account (free) and login to it. On the bottom left among your contacts there is a "phone call" button. It's toll free within the US, and you can just use a headset to talk through it, no phone required.
This would be useful if I had internet. I wanted to know this so when my power goes out, which also means my modem would go out, which ALSO means no internet, Skype, Gmail, nothing. But phone line's still work but my home phone runs on a DC plug-in so that doesn't work. My laptop has battery power which could run for about 3 hours when I'm using it.