You can encourage users to use the same device for longer and also make a new phone every year to advance technology and to serve new entrants to the market. I

You can encourage users to use the same device for longer and also make a new phone every year to advance technology and to serve new entrants to the market. I mean, look at iOS 14 -- it supports phones that are five years old. There is no prompting to upgrade to a new device. There is advertising on billboards and on TV, but not on the phone itself.