Apparently, from googling around it becomes somewhat obvious that the Cingular North America family of plans were discontinued a while ago. Ideally, I'd nonetheless prefer to switch to the Cingular North America for the extra 20 bucks a month, but as it doesn't appear that it is still being offered, I'm not at all excited about paying the standard termination fees or continuing to pay for the plan minutes I could no longer use.
P.S. Can I call their 800 number from Canada? :) Or the free 611 from the phone? ;)