If you are currently in the plan mentioned above just update online and add any domestic number, on any network – including landline numbers to your a-list and enjoy unlimited calling. You can also do the same with "pick five friends" and "my faves" of T-mobile. Then I actually added my Skype mobile to go number to "my faves" or "a-list" so I can dial it like using a phone card. So with my Skype World plan, I can call that Skype mobile number and dial any number from the 36 countries included in my Skype subscription. Now that is how I integrate my mobile minutes and Skype subscription to call World (36 countries).