[cuban leaf]

And why would anybody want to replace their existing smartphone (except if it was damaged, destroyed, lost or stolen)?

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Yep. I replace a phone when it quits working. That can be years. My wife finally replaced her iPhone 6 because it was becoming unstable. It was also on its second battery that was not giving much time.

[crusty old prospector]

I buy the older iPhone models like 7, 8, or 10 off of eBay for $300 or so. My wife still wants the home button and those are the last ones.