People upgrade their smartphone - on average - once every two years. And every time, you're faced with the same question: What to do with the old device?
Bin it? Sell it? Give it to a friend?
As it happens, there's a litany of creative uses for an old Android smartphone, that can make your life - and the lives of others - far easier.
Build an alarm clock. Or a robot. Help cure cancer. Secure your home. Save the rainforest. And much, much more.