You want to use these funny little emoti­cons?

The Emoji keyboard and all emoji characters are now included directly in iOS for all users to access, it just needs to be enabled first. Adding the Emoji symbols to your keyboard is simple and only takes a moment, and because virtually every Apple device supports the icon graphics display, those you interact with will be able to see the emoji icons on their iPhones and iPads too, even if they don't have the keyboard enabled themselves.

Just follow the steps:

1. Tap the Settings icon to launch the Settings app.
2. Tap General
3. Tap Keyboard
4. Tap Keyboardsagain
5. Tap Add New Keyboard
6. Tap Emoji from the list that appears

Now you can change the key­board to Emoji by pressing the Globe button on your key­board in apps like messages, mail, Notes ...

No other app needed!