I am facing a similar issue. I am dialing a US toll free number from India, but I get the same error of insuffient balance. I do not have Skype credit, but I but why do I need it for a toll free number? I am always able to place call from desktop.
Message to Skype: we totally understand this is BETA and we appreciate being part of it. This thread is about a problem paid subscribers encounter, I think it would be fair if you could provide paying clients a little update on this issue.
I recommend to download the latest Skype and search first.
To get the most out of Skype I recommend Skype Premium.
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I am facing the similar issue, please provide an update for this resolution and also the information with disclaimer should be shown for people while downloading WP7 Beta skype and buying subscription ( subscription doesnt works on WP7) so that people get informed about this blocker before buying SKYPE credits and wasting money.
Is there any workaround for this issue?