It should automatically be on your iPhone when you first turn it on. It's one of the default apps.
No. There is no app for that
Of couse. The phone comes with a YouTube app!
there is a youtube app that comes on every iphone (along with a maps app, safari, mail, etc.)
Yes look it up on youtube!
The iPhone / iTouch have YouTube built in as an app.
You can't.
iOS 6 removes the YouTube app from Apple, but you can still watch YouTube videos in the Safari browser via the YouTube plug-in (without need of Flash). If that is too slow, you can get the YouTube app from Google on the App Store. If that app's interface is too buggy, my personal favorite is an app called Jasmine. It too plays YouTube videos, but has a great interface similar to the old iOS YouTube app.
No, unless you are streaming it from a site or app such as YouTube
You would have to use the YouTube App for iPhones. You will not be able to upload a video from a mobile browser.
It may be due to an outdated app. Make sure that the Youtube app is up to date. You should also make sure that the internet connection is working.
If You download Youtube Videos with StreamFab first and then cover it into MP4 and you are not going to be woried about the internet connection.
To take a video from YouTube to the iPhone Whats App first open the chat window on Whats App. Next tap the arrow icon and choose what yo want to share.