Last year, Chinese phone maker Vivo began showing off its concept devices to the press before injecting some of those handsets’ technologies and features into market-ready models. That helps the company showcase its capabilities in the smartphone arena, and also gauge consumer interest in its ideas. In 2018, it revealed its Apex concept, which included a pop-up selfie camera, and a completely bezel-less display. We later saw those features in phones like the Vivo Nex and the V15 Pro. This year’s concept phone – the Apex 2019 – shows off a full-display fingerprint sensor, a unibody glass design with no…

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