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Smartphone penetration seems to be 40-80% in industrialized countries, according to 2019 figures from here: https://en.wikipedia.org/wiki/List_of_countries_by_smartphon...

In the Nordic countries it's over 90%

That percentage is of "consumers", might not include the entire population.

Hmm, so who might be excluded?

That linked survey didn't include their definition. But young children are one big group that comes to mind.