In a recent poll, we asked Mashable readers what they plan on doing with their old iPhones. Of the more than 900 respondents, 31% said they plan to sell theirs in order to buy another piece of tech while 25% said they planned on passing the outdated phone to a family member. You can see the complete poll results here.

These results aren’t surprising. That’s because after 18 months iPhones retain an 53% of its resale value â€"- 11% higher than Android and 12% over BlackBerry, a report by Priceonomics found in February.

Those numbers are a reflection of the total cost of ownership. “The iPhone hardware only costs you $13.20 per month if you resell it at the end of 18 months. Android phones cost 40% more,” the report says.

In most cases, handhelds lose much of their value rapidly in the first few months proceeding their release, then taper off over time.

So while it may make sense to keep the wealth in the family and pass your iPhone onto a family member, you have the opportunity to make back some of what you spent â€" something that can’t be said for Android or BlackBerry.

Image courtesy of Priceonomics

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