Emoticons built in to the iPhone keyboard? This Christmas, I got several text messages from my Mom on her new iPhone 3G. 
Several of them included emoticons in the body of the text like so:



I know she hasn't jailbroken her phone or installed any apps from the App Store.
I do know that she has iOS 5.

What are the step-by-step instructions to enabling emoticons on an iPhone?
Click Settings > General > Keyboard
Click International Keyboards then select the Emoji keyboard.
Switch between the two keyboards using the little globe icon to the left of the spacebar.