Chaim Haas, a public relations representative acting on behalf of Skype, said the application is available in every country in which the iPhone is on sale and in which Apple has an iTunes Store — with the exception of Canada. Haas said this is because of patent-licence restrictions but would not elaborate except to specify that it is a patent issue related to Skype, not Apple.

I couldn’t find what this patent is all about, but I’m pretty sure it’s being held by a carrier.