In France, some internet-access providers offer with the "box" (modem) free calls.
I've one, it's great. If you call someone who have a box it's 100% free. And the most interesting is if you call someone on the phone it's free too

.
Only one bad point : you pay when you call a cellular phone but lower from a normal phone.
Then the box can do wifi-access point & router.
In top of that, I've plugged my box on tv and I have 78 channels (200 available if you pay for some channels) freely.
That's why I think software like skype will not be used in future because Internet providers will give phone services freely.
I think the same thing about satellite tv...