I can't view my own videos on mobile devices
If a copyright owner claims your video, the owner may choose to restrict showing the video on certain devices (mobile phones/tablets, Smart TVs, and game consoles).
To learn more about the status of your video and the actions you can take, visit YouTube's Copyright Center. You can also view answers to common Content ID questions.
I can't view other channel's videos on mobile devices
YouTube’s distribution model allows monetizing partners to control the platforms on which content is available. For more info, view Common Questions about Distribution Settings.