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It is used for some effects - it flashes when you take a photo, and it guides you through face scanning in initial setup.

• dharmab 3y ago
  The flash could be a white LED. Apple has some other devices which require another device for setup, so it wouldn't be unusual for them. They could also offer setup at an Apple store.
  • astrange 3y ago
    > Apple has some other devices which require another device for setup, so it wouldn't be unusual for them. Hmm, I think that'd be pretty difficult because you can't guarantee the camera on another phone is good enough, unless you require everyone to have a phone from the last 1-2 years.
    • deleted 3y ago
      [deleted]
    • dharmab 3y ago
      You could display instructions on the phone and still use the depth camera on the device, which is presumably used for tracking anyway.