Why is my phone saying unknown part
My phone says “ unknown part “ under camera in settings and I never had the phone fixed
it just started when I restarted it
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From the article linked above:
You will see an Unknown Part 
message if the camera installation is incomplete or if the camera:
- Was replaced with a nongenuine camera
- Was already used or installed in another iPhone
- Isn't functioning as expected
I would suggest that you get an appointment at an Apple Store for an evaluation of your phone.