I prefer dis method bcus the video is downloaded in a very high quality.
1st go 2d page of d youtube video you want to download.
Go to d address bar in ur opera mini or any other browser, u wil see sumtin like http://m.youtube.com/watch?xavi- v=12345678900
Now, copy out only http://youtube.com/? v=12345678900 Note: there are eleven characters after the "v="
For example, lets use this sunny nneji's video LOVEY DOVEY.
The link in my opera is m.youtube.com/watch? gl=US&hl=en&client=mv- google&v=RRhY2YKzGuw
Now, copy out only http://youtube.com/? v=RRhY2YKzGuw
Then, go to www.zamzar.com/url and paste the link you just copied, select your conversion type as 3gp and input ur e-mail address.
Press convert and wait.
If it asks anything press YES.
...wait till it brings up sumtin, maybe a blank screen.
Now go to ur e-mail and you'll see a download link 2d converted file.
Download d high quality video 2 ur phone and enjoy.