With iOS 15 and the continued support of the iPhone 6S, it will officially be the most supported phone of all time- from late 2015 with iOS 9 to (at least) late 2022 with iOS 15 making a full 7 years.

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0:00 - 7 Years of Support
3:40 - iOS Update History
7:40 - iOS 15 on 6S & SE

Music:
https://pastebin.com/31cDwAq4