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Assume the following:

  1. FaceTime/iMessage are activated on an iPhone - using both the phone number associated with the SIM card that's currently inserted in the phone, as well as the email address of the Apple ID that's signed in

  2. The SIM card is removed from the iPhone, and a new one inserted that contains a different phone number

At this point, would FaceTime/iMessage automatically detect that a new primary mobile number is now in use and automatically update the number for both services - or would the old number still be used unless manually updated?

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