Phones are only getting pricier as the years go on, so selling your old handset is one of the best ways you can recoup the increasing cost of upgrading. And unless your phone is absolutely ancient, there's a good chance it's worth going through the trouble of selling it. And best of all, it's something you can feel at least kind of good about, because you'll be giving your old phone a second life with someone else (or having it e-recycled), and that's a lot better than having it slowly rot in a landfill for decades.

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