Hi I found a way to make YouTube app play videos in HD download the latest update its 2.4.4 . Then change your density to 160 and you will have YouTube show HD. I know the phones screen is not HD, but it shows much better then regular HQ.
Sent from my SGH-T989 using xda premium
Great find, i have mine at 185 and get hd, there is a visual quality difference, awesome!
Sent from the Darkside