Don't hesitate to update YouTube if there is a new version available.

You can go to App Store and YouTube and check its system requirement. One possible cause of the 'YouTube not working on iPhone/iPad' issue is the incompatibility between the iOS operating system and the App. While if YouTube is not working on your iPhone X, iPhone 8 or iPad in iOS 11, for example, YouTube quits unexpectedly on your device, follow the solutions in this part to have a try. YouTube Not Working on iPhone/iPad in iOS 11 Choose one of the options under Privacy to delete YouTube data according to your needs.Click the Menu option in the top left corner of your iPhone screen and then tap on the gear icon.Open YouTube App on your iPhone/iPad in iOS 11.By doing so, you can delete your Safari history, cache, and cookies all at once. Go to Settings > Safari and click Clear History and Website Data.No matter whether YouTube won't play on your iPhone/iPad in Safari or in YouTube App, you can clear your App cache to have a try. On iPhone/iPad in iOS 11, swipe up from the bottom of your screen to open Control Center and then click the Bluetooth icon to turn it off. This is an effective tip to try when YouTube is not playing on your iPhone/iPad in Safari or other browsers. Instead, it just deletes all settings related to the network. Don't worry, resetting network settings won't erase your iPhone. You can simply turn off your WiFi network connection and then turn it on again or reset network settings on your iOS device by going to Settings > General > Reset and clicking Reset Network Settings. In most of the cases, a poor network connection is the cause of the 'YouTube won't play on iPhone/iPad' issue. If YouTube videos won't play on your iPhone in Safari or in YouTube App, follow the tips in this part to fix the issue.

Ios version 11