I replaced my iPhone and want to transfer my Apple care?
How do I check the status and/or transfer AppleCare to new iPhone?
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You cannot transfer AppleCare from one device to another.
You can transfer it to the new owner of the phone: Transfer your AppleCare plan - Apple Support
or you can cancel it for a partial refund and buy a new plan for the new phone: Cancel or change the payment method for your AppleCare plan - Apple Support