How to transfer my device to my new mobile phone?

The devices are bound to your App account, so even if you change your mobile phone or mobile phone system, you only need to log in to your account in the App to continue using all the devices in your account. If you want to use a new mobile phone and a new account to control the device, you need to manually remove the devices in your previous account one by one (especially for strongly bound devices, such as door locks, doorbells, cameras, etc., otherwise you cannot read those devices in your new account), and add them one by one in the new account of the new phone.