How to bind the Xiaomi Watch S3 to a new phone?

For this problem, there are two different situations as follows:
1. If you logged into another different Mi account, you need to restore the factory settings on the watch, and then rebind it with a new phone;
2. If you logged into the same Mi account on the new phone, you can open the [Mi Fitness] APP >> [System] >> [Connect new phone] to rebind the watch with a new phone.