As of yesterday, no YouTube videos could be played on my iPhone through the built-in YouTube App. As we recently modified settings on the router in our office, we thought it was something on our end. Sure enough, no router adjustment could resolve the issue. We continuously get the “This video could not be played” error message. Others on MacRumors are also reporting the latest YouTube outage on the iPhone. Essentially, no YouTube videos are able to be played through the YouTube App on the iPhone. I am sure Apple and YouTube are aware of this glitch and a fix is just around the corner. In the meantime, there is a temporary solution. Just use the Safari browser (on your iPhone) to view YouTube videos instead. This should allow you to continue enjoying YouTube videos on your iPhone.