Could someone provide a link to somewhere on Skype's site where they state that?
Assuming we're talking this plan, I see nothing to indicate that they try to find where you're calling from and bill differently. All ******edness of pricing things that way aside (many things are priced in ******ed ways after all, especially regarding mobile phones), that's not the way Skype does things, according to their knowledgebase.

Edit: My understanding is that calls from your computer/N800/whatever, on any network where Skype works at all, to any US/Canada phone number are free. Calls to any non-US/Canada phone number cost the normal SkypeOut rate.