Xiaomi's flagship smartphones have had in-display fingerprint sensors for many years now, but they've all been of the optical variety. The same goes for OnePlus. That might, however, change next year with the Xiaomi 15 series and OnePlus 13. According to two separate sources on Weibo, China's equivalent of X (formerly Twitter), Xiaomi is currently testing ultrasonic fingerprint sensors for the upcoming Xiaomi 15 flagship family, which is already in development. Xiaomi 14 The Xiaomi 15 will keep the fully flat screen of its predecessor, while the Ultra will go with a curvier glass...

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