Google has removed restrictions on 4K video playback on the YouTube Android mobile app.

Until now, choosing 4K playback has required a 4K smartphone and sufficient internet connection. Now, some previously unsupported devices have the ability to run 4K. Users of smartphones with screen resolutions lower than 4K began to report this.

Initially, a user of the social news resource Reddit drew attention to the phenomenon. As you can see in the screenshot, the app allows you to select the 2160p60 option regardless of the actual screen resolution.
According to members of the mobile developer community XDA Developers, this may not be an intentional introduction of a new feature, but a simple mistake. If this is a mistake, then it is quite widespread.

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