[adolph]

Out of the gate, Canada and the US share 1 as country code and includes entities that aren't countries like Globalstar (Mobile Satellite Service):

https://en.wikipedia.org/wiki/List_of_telephone_country_code...

[least]

It’s not telephone country codes, but ISO 3166 country codes:

https://en.wikipedia.org/wiki/List_of_ISO_3166_country_codes