According to Apple’s Official Release Note:
- Fixes an issue where audio and haptic feedback would not work on some iPhone 7 and 7 Plus devices.
- Addresses an issue where touch input was unresponsive on some iPhone 6s displays because they were not serviced with genuine Apple parts.
You can update to iOS 11.0.3 which is available via OTA (Over The Air). Just launch Settings – Go to General – Software Update and Hit Download and Install.