To rebind the Xiaomi Watch S3 if you change a new phone, please refer to the following methods:
Method 1:
If you want to change login binding for different Xiaomi accounts, please perform factory reset on the watch and then rebind it with a new phone.
Method 2:
If you use the same Xiaomi account to log in and bind the new phone, please tap on [System] in the watch settings and select [Connect new phone] to rebind a new phone when the watch is connected to the original phone.