Australia's the country I would suggest. I visited there at the invitation of the transport department some years ago. They have adopted SMS.
Many countries are adopting SMS, but no country in the world except Canada has implemented SMS without regulatory oversight as a requirement.
Some of my colleagues in some of the other countries with whom I've collaborated about aviation safety over the years are stunned by the fact that we have effectively abandoned regulatory oversight and imposed SMS. It is a good concept, but not without oversight.