Fingerprint readers are now essential

It’s been a long time since you could point to a single item on a spec sheet and say that it distinguishes the latest smartphones from their predecessors. The must-have features in phones are usually more ephemeral, such as a camera that’s easy to use and a design that appeals to one’s senses as well as sensibilities. Fingerprint readers are today’s exception to that rule: they draw a clear line of hardware distinction between the phones of the past and those that we’ll be using in the future.

2015 has been a great year for fingerprint scanners in two major ways. Firstly, all companies figured out how to make or acquire really fast and accurate sensors. Last year, only Huawei and Apple could lay claim to having the technology at a...

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