Your YouTube might not be working on your phone due to several common reasons including poor or unstable internet connection, outdated YouTube app, corrupted cache or app data, device software or compatibility issues, or account related problems. To fix this, try restarting your phone to clear temporary glitches, check and update your YouTube app and phone's operating system to ensure compatibility, and clear the YouTube app cache and data in your phone settings. Also, make sure your internet connection is stable and strong. If permissions are restricted for YouTube, ensure they allow network and storage access. Freeing up some storage space may help as well. If the app still does not work, verifying that YouTube's servers are not down through a site like Down Detector can help rule out external issues. These steps usually resolve YouTube not working issues on phones.