https://9to5mac.com/2018/03/05/didnt-upgrade-to-the-iphone-x/ Interesting article, and doesn't take a rocket scientist to guess the main reasons here. I would think this applies to high end Android phones too, like the Galaxy S9, etc... - That the top reason those people haven’t recently upgraded is because their current iPhone “works just fine,” with 44 percent of people choosing that answer. - The second most common reason among survey respondents was that the new iPhone is “too expensive.” 31 percent of respondents cited that as their reasoning for not upgrading. Smartphones have become like the PC industry, years ago it was worth while to upgrade frequently to get better and better performance, but for a long time now, that's not needed whatsoever anymore. Same with smartphones, as long as your phone is in good condition, not cracked or damaged, and the battery is still good. Then the mass majority do not need a brand new phone every couple years, most average Joe's and Jane's that aren't tech geeks, can keep a phone 3 or 4 years easily. For the Grandma's out there a iPhone 6S is more than fast enough and good enough for them, even that's too much power than they really need. Smartphones are becoming like appliances.