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I'm unhappy using my phone... It lost my files, always hang... And youtube can't run even if I have strong connection.. I just use my phone in basic used only. Other application Is worthless huhuhu what happen to my phone..
If your phone keeps freezing, try restarting it by taking out the batteries, if it keeps happening then you might want to delete some files you don't need in order to free up some space. And regarding your issue about YouTube, a lot of people have the same problem, I suggest waiting until RIM or YouTube fixes it, in the mean time use YouTube plays from the AppWorld or you can use Opera's browser to watch YouTube videos, the quality is pretty poor though.