OPPO launched a new product line last year, which focuses on online marketing, called K series.

OPPO K1 impressed us last year with its design, color and in-display fingerprint. This year, OPPO launched OPPO K3, which has an update on the predecessor. Let’s take a look.
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https://www.gizmochina.com/2019/05/31/oppo-k3-review-budget-phone-with-pop-up-camera-and-full-screen/