Seriously though @shane0911 Maybe see if there is something in the browser settings on your phone. If you're not using it already, I would suggest downloading Google Chrome. When I had my android, Chrome worked best with just about everything.
That is exactly what I'm using. I have looked and tried everything I can find. Sound works on videos embedded in say Twitter or Facebook just not TF. So puzzled.
Touch the display. There is a mute icon with a speaker and / over it. Its default so nobody hears you watching porn at work, says a friend.
Found it... Fur is right... but, while the video is playing, tap the screen so you can see the controls... then see if the speaker icon has a slash through it, like this... (I think Chrome looks the same on android and iphone, so it should be at least similar):
Clear the cache in your browser then reboot. Repeat if necessary. You call also clear cache in youtube via app manager. If that fails try a browser called puffin. Adobe flash probably your issue but will work here.
When my phone is on do not disturb it mutes all media, I have to turn do not disturb off to look at youtube. Also sometimes the player is muted, and you have to click on the video to get the YouTube menu that has the sound icon, make sure that is good.
