When I updated my iPhone 8 to iOS 11.3.1, the true tone switch in the control center was gone and the auto brightness feature in General --> Accessibility --> Display Accommodations is gone as well. I've tried doing a soft reset as well as erasing all settings, this didn't solve the problem. Then I tried wiping the phone completely and restoring it from iCloud, which didn't help either. The features used to work in earlier iOS versions. Is anyone familiar with this problem?