Free PC-to-Phone services with free PC-to-PC feature:

Skype – Now you can make free unlimited phone calls from skype to regular phone within U.S. and Canada with no minute limits until the end of this year. This only apply within U.S. and Canada, if you’re using Skype from other countries the calls won’t be free.

Gizmo – I heard about Gizmo for the first time in an email that says “Skype bad, Gizmo good”. Now Gizmo can make calls from PC to mobile and landline phones FREE in 60 countries (click for more information), but it requires both participants, the one making phone call and the one receiving, to use Gizmo to make PC-to-PC calls actively in order to qualify for this.

Free Phone-to-Phone services:

Jajah – Like Gizmo, active users can use it to make long distance phone call with other active users. Unlike Gizmo, it’s phone-to-phone, to use it you have to go to its website to type your phone number and the number you wish to call, after a while your phone will ring – your friend’s phone will ring, and you can start talking. Unregistered users can only try it for 5 minutes, registered users can call 1000 minutes a month, five hours a week, 1 hour a day. (for more information click here)

Phonehog.com – Like Skype, this service is only available in U.S. and canada unless you have a way to call its toll-free numbers for free in other countries. Unlike other services, it’s intended to be used in regular phones, to use it you have to dial the toll-free number and enter the pin number they gave you, just like using phone cards. When you registered you have no free minutes yet, to add free minutes you have to go to its website and sign up offers from other companies, many offers are free, some are paid, most paid offers gives you more free minutes. If you want phone card or you want to make phone call from public phones (20 units per connection) it should be your choice.