Plenty of studies have shown that iPhone users upgrade their handsets more often than other smartphone users. But what should you do with that old iPhone once you have upgraded to a new one? There are plenty of good options out there, and some of the most common ones include selling your old phone using a site like eBay or Craigslist, trading it in for credit toward the purchase of a new phone, or giving it away to a friend or loved one.
But there’s another option you might not be aware of that is incredibly useful and completely free.
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