Not to want to disagree with our esteemed host, but I distinctly remember 5 digit Zenith numbers in Bell Canada territory. Zenith
50-000 and Zenith 80-000 that would get you the nearest detachment of the Ontario Provincial Police (OPP) and the nearest Ambulance dispatchers.
How about the non-exchange, non-dialable, ZEnith X-XXXX numbers?.
>> These were pre 800 800 numbers. "Call you local operator and ask for
>> ZEnithX-XXXX, no cost to calling party".
> [TELECOM Digest Editor's Note: (in 2006) ... Zenith and Enterprise
> numbers only had four digits, _never_ five; they were never
> dialable and today have been largely replaced by 800, 888, 877 and
> 866 numbers which _are_ dialable. Pat]