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the built in ones
There are literally thousands of patents for the iPhone. Apple have patented every element of the iPhone from the screen, shape, electrics, display, icons and more.
On an iPhone/iPod just hold down one of the icons and then they'll jiggle
Holding your finger on a app icon for approx one second will make all the app icons jiggle, allowing you yo rearrange your springboard.
Yes. If you have an iPhone, you can get them using applications. I have been using Emoji Emoticons Art for this.
Keep your finger on the icon for 2-3 seconds. After that you will see that all icons will start to wobble. You can than delete icons.note: you can not delete icons that came with the iphone when it was bought
The icons represent programs that are running on your phone. All running programs eat up battery power. Shutting down programs after you use them will conserve battery life.
Press the icon and hold for approx. 2-3 seconds. When the icons begin to "shake" then you will be able to move them around. When re arranging is complete just press the "home" button.
Press the Home button (the one in the middle below the screen).
I assume by apps you mean programs preloaded. The way you would tell that is get an iPhone that has no apps and look at the icons. Those icons are: calendar, photos, camera, YouTube, clock, maps, notes, stocks, calculator, settings, weather, safari, mail, app store, phone, messages, iPod, contacts, iTunes, (voice memos on OS 3.0). I do not have the iPhone 3Gs so if there are more I don't know them.
It was probably someone with an iPhone and used the little characters/icons in the text. Only people who have iPhones can see them or they will just look like squares if sent to non iPhone users. :)