Why youtube only let play some videos in a pc computer, but not in mobile phones?

why ., I cant play youtube videos on opera ? it says : Hello, you either have JavaScript turned off or an old version of Ado...

the plan i have right now wont let me send anything, and i cant change it because the plan has 3 other phones on it. soo woul...

is there a one that is both for phone & pc? if so, whats it called?

How do you upload a photo from your phone to the computer

I have a blackberry curve and I can't seem to play youtube vids. I can get on the site and it let's me choose a video but whe...

when I play a video in my pc , it's very vey dark ,, sometimes I cant see people's faces ,, what is the problem

i have a nokia 6630 and a cable which came along with it..how do i configure the pc to work with the mob? What all software i...

Is it any way I could get my mobile g1 phone play any thing else other then youtube

how do you put pictures from your phone to the computer?

Can I get videos on my zune off youtube?? how?? also can I get movies on it?