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According to recent reports—like this one in Android Police — https://www.androidpolice.com/2021/02/02/phone-hub-for-chrome-os-is-slowly-rolling-out-to-beta-and-dev-channels/ - the new Phone Hub feature can now be tested in Chrome OS 89 (Dev) and 90 (Canary), and it’s got a much cleaner and more polished UI than it did in its initial leaked appearance last August.