https://www.computerworld.com/article/3676908/why-are-you-hoarding-your-old-smartphones.html
https://www.marketwatch.com/story/consumers-hoard-13-billion-in-old-iphones-2014-02-12
Even though an older phone might not be as fast or have the same picture quality, it still can be used as a backup device. Even just as an alarm clock, flashlight or as a basic camera...
https://studyfinds.org/5-billion-phones-thrown-away-2022
https://www.abc.net.au/news/2019-07-31/getting-rid-of-ewaste-mobile-phones-study/11339412