Samsung is rolling out a software update to the Galaxy Watch, Gear S3 and Gear Sport that will bring the latest Galaxy Watch Active’s One user interface to the older models.

According to Engadget, the update will see the a livelier and easier to use interface that matches the One UI found on Samsung’s most recent Galaxy phones, but there are also promises of better battery life too.
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https://www.pocket-lint.com/smartwatches/news/samsung/148101-samsung-galaxy-watch-active-features-come-to-older-smartwatches-including-better-battery-life