Get Emoji icons on your iPhone with Emoji Free
You can get the popular emoji icons on your iPhone without a jailbreak, thanks to a free app available at the app store. Aptly named Emoji Free is very simple to setup, all you need to do is download the app and then enable the new emoji keyboard:
- Tap on Settings
- Select ‘General’
- Tap on ‘Keyboard’
- Select “International Keyboard”
- Select “Add New Keyboard”
- Tap on “Emoji”
- Reboot your iPhone by turning it on and off
You can now use the emoji icons within text messages, emails, and Notes. The recipient of your emoji styled messages does not need to have the app installed, but to see the emoji they do have to use another iPhone, iPod touch, or iPad.
Emoji emoticons are extremely popular in Japan and are part of their keyboard sets by default. The popularity of emoji has been spreading around the world so it’s not unlikely that future versions of iOS will feature an optional emoji icon keyboard. In the meantime, Emoji Free works with iOS 3 and later.

No Emoji kb shown on my UK (bought SIM free from Apple store) iPhone 4 with software 4.0.1
[...] can write whatever you want, change the colors, and using emoji you can project graphics too. The only real requirement (other than the app) is a digital camera [...]
This App didn’t work for me.
I searched in the web and found this App ===> SMS Smileys
This works fine and I have now the emoji keyboard on my iPhone 4
[...] This is a change from past iOS releases where you would either need to jailbreak or install a 3rd party application in order to use Emoji from the iPhone, iPod touch, or iOS in [...]