I am pretty sure Google is not blocking calls to nuns because it is trying to be evil. Either they are not a regular phone number, or this is a bug. It's beta. There will be bugs.
I really hope AT&T's whining doesn't ruin this for the rest of us. I love Google Voice, and it would be a shame to see regulations kill it off before it is even out of beta. It's a free service. Why should it have to let me call 900 numbers?
I hope that this will change the rules for carrier charges, but I also think Google needs to play by the same rules as everyone else. Blocking rural calls is evil when the rural users have no knowledge of how the system works and are just innocent victims.
Will these customers move to mobile devices or at least a cellular connections in the coming years?
The US government's last bill (this administration) was utterly useless to provide independent internet. It had the great phrase "if broadband service is available to anyone in the service area for any price, the service area is ineligible for funding".