# Why can't I turn on the camera? (/en/api-reference/faq/quality/video_camera)

> For AI agents: see the complete documentation index at [llms.txt](/llms.txt).

There are many reasons for a camera start failure. Check the following:

* Check if the camera access permission is enabled. Both Android and iOS systems have a runtime access permission function under System Settings. Additionally, security software on Android may control camera access permissions.
* Check if another application is using the camera. Close all applications, restart your phone, and try again.
* Check the camera hardware. Start the built-in video camera to test the recording function.