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?
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.