There was a story recently about how "83% of US teens have an iPhone, Android 9%" - https://news.ycombinator.com/item?id=19610357 https://news.ycombinator.com/i

There was a story recently about how "83% of US teens have an iPhone, Android 9%" - https://news.ycombinator.com/item?id=19610357 https://news.ycombinator.com/item?id=19610357 So, they're certainly a monopoly in that market today and possibly in the general market in the near future. I have also read that you don't even need to have a higher than 50% market share to be considered a monopoly. You simply need to affect the entire market, which Apple certainly does with their 45% general market share in the US.