3 have recently announed their Series X phones & tariffs which include unlimited Skype calls from a mobile phone.
The pitch is...
Skype lets you make unlimited Skype calls to all Skype PC users and other Skype 3 mobile customers, anywhere in the world. With your X-Series mobile, you can now use Skype on the move.
Even when you can’t be near your computer, you can still make calls. And you can see when your friends are online and available to talk.
A bold move I think. The Skype package is an add-on of your existing mobile voice / text tariff.
X-Series
Rupert