With respect to markets where the iPhone has enjoyed a more dominant position – especially the US – Apple recognises that customers don’t replace their devices as often as they used to. A recent report by BayStreet Research estimated that, while the average user upgraded her iPhone every 24 months as recently as 2015, by the last quarter of 2018 this holding period had jumped to 36 months.
This is due to fewer carrier subsidies, according to Apple – but also, in my opinion, to the fact that the new devices do not have much more to offer. I use an iPhone 7, which I bought in 2016, and I am honestly not inclined to spend US$1,000 for I-am-not-sure-which new features on a newer version. I already get much more from my current device than I need.