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https://apple.slashdot.org/story/17/09/13/1516242/the-iphone-is-guaranteed-to-last-only-one-year-apple-argues-in-courtI can only speak from personal experience. I got the 6 Plus with 64GB back in summer of 2005 (after owning the iPhone 5 for nearly 2 years).
Only thing I've noticed is that I drain my battery faster than I did a year ago. I always carry a portable charger that's good for 2-3 charges, so it's not a big deal.
I never upgraded to the 7 because there was just no compelling reason.
I have mixed views on the 10. I have yet to read a new feature that I'd love - but I also don't want to be several versions behind.
I really love the new Samsung phones - but, I still prefer iOS over Android.