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Replacement iphone

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Yup, exactly. Even if you do a complete secure backup of the old phone, and then restore the new phone from that backup, you'll still need to pair the car to the phone while actually sitting in the vehicle, with one of your keycards.

Wife and I replaced our Samsung phones with newer model Samsung last week, I can confirm that you have to pair the new phone using the keycard like you did with your original phone. It was easy, took about a minute each. You can delete your old phone as a key or keep it. Your old phone can now be a spare phone key.
 
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