Well, there are a lot of free emoticons applications in App Store that you can choose from. In my iPhone, I specifically installed Emoji Free. Once you installed the free application, you need to restart your iPhone. After that, go to Settings - General - International - Keyboards.
At Keyboards, find Japanese then turn Emoji ON.
To test if Emoji is working, Compose a message then tap the Globe icon before the space bar. You will see five additional icons wherein you can choose over 450 emoticons. Cool right?
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