Why can't I play youtube video on my iPhone 5?

I don't know if it just or if anyone else has this problem but I'm forced to use a app but why can't I play it on the regular site that's retarded.

It doesn't support iPhone 5… I have an iPod 4th generation and even then it's hella glitchy.
I use the app all the time, it's great quality, easier to navigate than the actual site.

  • Why won't YouTube won't play videos on my iPhone? My phone randomly stopped playing YouTube videos. It just shows that it is loading and never play. I have great Wi-Fi connection. Every other app including Netflix runs smoothly. It doesn't work on the app or browser. I cleared the cache on my browser. I reset my phone. My phone and the app are updated completely. I have no idea what to do.
  • Why iphone video is in box when l post it to youtube? L have filmed stuff with iphone4 l posted it on youtube and screen is cut its not full screen but all images are "in box" see example - annoying! How to fix that?
  • Why does my iPhone say invalid when I try to upload a video to YouTube? I have a YouTube account and when I took a video on my iPhone 5 I clicked upload to YouTube and it came up as a sign in screen. So I entered in my username and password and clicked sign in. It keeps saying invalid login? What's up?
  • Why does it take so long to buffer a YouTube video on my iPhone? I have an iPhone 4 and my Wi-Fi is very slow for buffering videos of every kind as it takes like 10 mins to buffer a 2 min video and it doesn't do this at friends houses and T's only on ios devices here at my house tht have that trouble. Any way I can make my Wi-Fi faster?