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.
You don't upgrade YouTube. It will do system updates and change format etc., by itself.
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it gives you air play and makes it harder to jailbreak
Yes. If you update your iPhone's software using iTunes it will lock your iPhone again. You will then need to unlock it again.
plug your iphone into your computer and go into itunes click on your phone under devices go to summary and press check for update or update iphone.
No.
You can't.
Simple answer: Yes.Only update when the Jailbreak you use has a new version / then only update the Jailbreak, not the iPod/iPhone.
Update the software in iTunes and it will do it for you.
yes. the current update is 3.1.3 and to update to it you have to restore you iphone, update it then re-jailbreak it. but at this moment in time this is not an jailbreak for firmware 3.1.3.
The update 6.1.6 helps to maintain the working efficiency for the iphone 3gs.
What you do is you go and plug up ur iPhone to the iTunes and click on the update button