18 wild uses for your old Android smartphone

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People upgrade their smartphone once every two years, on average. Every time, they're faced with the same question: What to do with the old device?

Bin it? Sell it? Give it to a friend?

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There's a litany of creative uses for an old Android smartphones that can make your life far easier.

Build an alarm clock. Or a robot. Help cure cancer. Secure your home. Save the rainforest. And much, much more.

Here are 18 of the best possible uses for your obsolete handset.