How Do I Delete Custom Icons From 3g Apple Iphone

Alright, so I've been researching on how to delete icons off of the Iphone & I keep coming across answers to delete downloaded applications. I'm trying to delete the icons that came with the Iphone, such as: Youtube, Stocks, Safari, etc. I also do not want to "Hide" them. I want to completely get rid of them! I don't know what I did but for some reason I have two SMS icons, they work the same & everything but I cannot delete it. >< Please help! ):