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If each app on Android gets its own UID, then how are phone users identifed? Do they own some different UID or something? Or are they in special group "users"?

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The human users of the phone don't correspond to different Linux users. The human users are identified only within Android itself, not to apps. Android provides a completely separate environment to the app for each user - a little like a Linux chroot - so the app doesn't have to worry about separate users. When a new user runs the app, it just looks like a fresh install on a new device, because it's given a brand new data directory, separate from those it's given for other users.

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