In the past few years, the market for smartphones has become a lot more like the one for used cars. 

Whereas many of us once upgraded our phones every two or three years, and treated old ones almost as if they were disposable, more than ever these phones are sticking around, and having a long afterlife. That could affect everything from who wins the smartphone wars (hint: Apple) to how the dominant players in this industry make most of their profits (spoiler: not from selling hardware).

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