a couple of relevant articles:
This Is What It’s Like To Not Own A Smartphone In 2018
List of countries by smartphone penetration - Wikipedia
(It's surprising the fraction of users in Japan -- known for being high-tech -- is only about 1/2, while USA's is about 3/4.)
This Is What It’s Like To Not Own A Smartphone In 2018
List of countries by smartphone penetration - Wikipedia
(It's surprising the fraction of users in Japan -- known for being high-tech -- is only about 1/2, while USA's is about 3/4.)