When you get the latest YouTube App on your iPhones, iPad, BlackBerry, Nokia or Android devices, you can watch your favorite videos from the comfort of your couch or on the Go.
* Enjoy “what to watch” recommendations
* Find videos and channels with voice search and instant search suggestions
* Subscribe to your favorite channels for easy access from the guide
* Sign-in to access your playlists and “watch later” list
* Share videos via Google+, E-mail, Facebook and Twitter
Source: YouTube Play Store
Here are links to Download YouTube Mobile Application on your Phone.
Download Here - Free Mobile App for All Smart Phones
on Android Phones on Nokia Store on BlackBerry on iPhone/iPad