If you have already downloaded the latest iPhone firmware 2.2, you will notice that it is not possible to show any emoticons on your phone, unless yours is a Japanese version. Of course, people are mad about it. So, a developer took task to enable the emoticons on all iPhone firmware version 2.2. BTW, if you are on firmware 2.2, you are already automatically able to see emoticons.
Instructions after the break.
You will need a little bit of technical knowledge to do it. Too bad, I don’t own an iPhone. If not, I will make a simple video on how to do it. Anyway, Here are the instructions I copied. Do it at your own risk.
You need to edit the file /User/Library/Preferences/com.apple.Preferences.plist on the device -> whether you use a jailbreak to achieve this or merely some iTunes backup editor is up to you.
Add the following boolean key as ‘true’: KeyboardEmojiEverywhere.
Then merely go to the Keyboards section of the Settings app, hit Japanese, and turn on Emoji. Will work for any text field/view in the OS, including on websites, AND including the titles of items on SpringBoard (e.g. if you save a bookmark to the home screen).
Click here if you are still unsure (PS: I got to know it from this site).