Why can't I watch HD videos on youtube on my iphone 5

I want to apologize if this has been asked before but I just couldn't find a thread that had this discussion. I just realized the other day that I can't watch HD videos on youtube on the iPhone 5. My friend just got a Galaxy S3 and we were comparing the playback quality and there's a huge difference. Both of us were connected to a Wi-Fi network and we chose the same exact video and on the Galaxy S3, it tells you that its playing the HD version of the video whereas on the iPhone 5, it by default was playing the low quality version and there was no way for me to choose the HD version. So my question is, can the iPhone 5 play HD video on youtube at all? Is there an option that I need to select for it to do that?

Because it is too much for the internet signal on your iphone to handle. But you can jailbreak it and download "HD viewer" and it should work just fine!

I have a iPhone 5 and it plays HD YouTube videos all the time. You may need to check your Wi-Fi speed or turn you cellular data off when connected to Wi-Fi. But as I said before mine always play HD on YouTube.

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