Samsung watch compatibility list
https://www.samsung.com/uk/support/mobile-devices/what-phones-are-compatible-with-the-galaxy-watch/
Galaxy Watch Active2, Galaxy Watch Active, Galaxy Watch: phones running Android 5.0 or higher with 1.5GB RAM or more are compatible. Gear Live, Gear S2, Gear Fit 2, Gear S3, Gear Sport, Gear Fit2 Pro: phones running Android 4.3 or higher with 1.5GB RAM or more are compatible. Open Settings on your Galaxy Watch. Tap General > Connect to new phone. Once the backup is complete, tap Continue to begin the reset. Importantly, there are no warnings after this step. Tapping Continue will immediately reset your Galaxy Watch. Open Settings on your Galaxy Watch. Tap General > Connect to new phone.
Open Settings on your Galaxy Watch.
Tap General > Connect to new phone.
Once the backup is complete, tap Continue to begin the reset. Importantly, there are no warnings after this step. Tapping Continue will immediately reset your Galaxy Watch.
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