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How to transfer a Wear OS smartwatch from one phone to another
Transferring the Pixel Watch 2, Galaxy Watch 6, or OnePlus Watch 2 to a new Android phone each uses a different method.
If the prompt doesn't appear on your new phone, you may need to either download Galaxy Wearable from the Play Store or find the watch in your Bluetooth menu in Settings. We're happy that Google finally prioritized simple transfers, for people who frequently swap between cheap Android phones but want to make their smartwatch last across devices. That means it'll be ready to transfer from one Android phone to the next, offering long battery life and a bright, thin-edged AMOLED display.
Or read this on Android Central