Thanks for using the Apple Support Communities! I understand the camera on your iPhone is not working as expected with FaceTime, and other applications.
If you notice the camera is not working as expected while using the Camera app, in addition to FaceTime and other applications, let's have you go through the troubleshooting steps in the following guide: Get help with the camera on your iPhone, iPad, or iPod touch
You see a closed lens or black screen
If you see a closed lens or black screen when you open the Camera app, try these steps:
- Make sure that there’s nothing blocking the camera lens. If you’re using a case, try removing it.
- Force the app to close, then open the Camera app again.
- Restart your device, then open the Camera app again.
- If your device has a front and rear camera, try both cameras by tapping . If you see the closed lens or black screen on only one camera, take your device to an Apple Retail Store or Authorized Service Provider for more help.
If this behavior only occurs while using FaceTime and other applications, the following support article offers helpful troubleshooting suggestions: If an app unexpectedly quits, stops responding, or won’t open
Let me know how the provided steps work for you.