OnePlus's OxygenOS skin is known for being a lightweight (at least until recently), customizable take on stock Android, but it doesn't run on all the company's devices. Google Play Services isn't available in China, so OnePlus phones in the Chinese market run software called HydrogenOS that's optimized for the region. The latest version of the OS adds features like an always-on display, redesigned weather app, and an updated dark theme — some of which could make their way into OxygenOS 11.

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