How to transfer data after Apple activation (how to transfer data for activated Apple) operating system

How to transfer data after Apple activation (how to transfer data for activated Apple)

Data transmission is a routine operation after the phone is replaced. After the iPhone 12 arrives, the user needs to first transfer the data when activating the phone, and transfer the data from the old phone to the new phone. But it is a relatively strange operation for many small partners. So what should we do? How to activate the apple
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