As you that iPhone users can download videos from YouTube using some apps. Here is a totorial to download YouTube videos from YouTube on Non-jailbroken iPhone.Downloads Lite – A free apps from App Store will let you download files to to your iPhone or iPod Touch. You can play video or download and watch later. Here we have a simple but very useful Tips on how to do that.
Step 1: First, grab your iPhone and go to the Appstore to ( download Downloads Lite ) application. Downloads Litedownload files, supports resuming of interrupted downloads, always download with correct filename; it can also extract RAR archives and many other great features.
Step 2: After you have downloaded Downloads Lite, open the application and enter the following address (in the address bar at the top): http://www.youtube.com/?nomobile=1
Step 3: Now choose a video of your choice and then press the rest of the video link below
Step 4: Click “Download” and download the video in the tab “Downloads“:
Step 5: Once your video download is finished it will be located in application “Files“, so you can watch it even in airplane mode.
NOTE: This app let you download not only from YouTube, you couyld download from popular file hosts like RapidShare, DailyMotion, etc… and use the Rar extraction feature to get usable files too.