IPhone 4- I can't watch videos on youtube or any other videos?

On youtube it keeps on saying playback error or either that it loads way too long that I give up.
I've cleared the cache. I'm not sure whether I have good connection or not but I guess that I do have good connection.

Is there any way to fix this?

Make sure you have the latest official youtube app for your iPhone-4
Or Download it here- (Version 1.1.0.4136)
-https://itunes.apple.com/en/app/youtube/id544007664?mt=8

If it doesn't work, try the following:

> Turn off 802.11n on your AirPort Extreme router.
> Turn off the guest network on your AirPort Extreme router.
> Change the DNS settings in your iPhone settings for that router to OpenDNS settings of 208.67.222.222, 208.67.220.220 or Google's DNS settings of 8.8.8.8, 8.8.4.4\n-
> Reset network settings in you Settings App > General > Reset > Reset Network Settings.

Thread:
-http://www.appleiphoneschool.com/2010/07/28/fix-slow-youtube-on-ipad-and-iphone-4/

3 other people have reported the same problem in google forum, but no answer received.
-http://productforums.google.com/forum/#! Msg/youtube/9mdoGxCq7DM/Ybmr3J9toVUJ

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