While the Emoji keyboard is not new to the iPhone, it seemed as if it was disabled in iPhone OS 4.0 .
For those of you developers big into the Emoji keyboard, here is how to regain the Emoji keyboard while still using iPhone OS 4.0 :
1- Run your Emoji app; exit app when prompted ( I used Emoji Free for this procedure )
2- Go to the Settings application
3- Go to General
4- Go to International
5- Go to Keyboards
6- Select Add New Keyboard
7- Scroll down to the “Emoji” keyboard. Voila! Now you have your Emojicons back for use in email, SMS and more. Enjoy!
-Does not work if you go to the Keyboard settings selection directly.
-Reset your device after this procedure in order to properly regain Emoji.
-You cannot delete the Emoji keyboard after conducting this procedure.