The vivo V70 follows the tried-and-true formula of a great mid-range smartphone, with a huge battery, a startlingly bright display, and a camera system anchored by a genuinely useful 3× optical zoom. Every year, reviewers moan that the mid-range market is overcrowded. And every year, the mid-range market replies by producing yet another phone that makes you question why anyone needs to spend flagship money in the first place. The vivo V70 ...

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