It might seem as if everyone has a smartphone, but it's not the case. So-called "feature phones" the previous generation of mobile technology, are still used across much of the world.These phones don't have high-tech sensors or app stores, but their low cost and reliability make them very popular in countries such as India. That's why Kuldeep Yadav and colleagues at the Indraprastha Institute of Information Technology, New Delhi, are researching ways to bring smartphone-like functionality to older mobiles.
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