Before visiting our store, we recommend resetting your iPhone's Face ID, then setting it up again. Go to Settings > Face ID & Passcode and tap Reset Face ID. Then tap Set up Face ID to set it up again. If you still can't enroll your face, we might be able to resolve the issue with a rear camera repair. If our diagnosis finds an issue with the camera, we'll perform the repair to see if the issue is resolved. If the issue is not resolved, we'll perform a whole unit replacement instead of a same-unit display repair. Express Service uses only the best quality parts and precision equipment to ensure that you get your iPhone back working the way it should be.