How do I unpair and pair my Amazfit Bip 6 with a new phone?

First, synchronize data on your old phone and unpair the device in the Zepp app under Device > Amazfit Bip 6. For iPhones, also unpair in Bluetooth settings by selecting "Forget This Device". Then, restore the Amazfit Bip 6 to factory settings and pair it with your new phone as if it were a new device.