Galaxy Watch 4 and Watch 5 received WearOS 4 and One UI 5 Watch update in the US : r/GalaxyWatch
Galaxy Watch 4 review: Still the best Android smartwatches around | Engadget
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5 things to try with Wear OS on the Samsung Galaxy Watch4
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Samsung Galaxy Watch 4 Review | Trusted Reviews
State of Google Wear OS 4: List of compatible smartwatches
Wear OS 4 is now official on the new Samsung watches, ahead of the Pixel Watch for now - PhoneArena
Samsung Galaxy Watch 4 review: A Wear OS watch for Samsung fans
Google showcases Wear OS 4 with battery life improvements and user data backup functionality - NotebookCheck.net News