Hat tip to iJustine (and Brent for letting me know):
- Buy http://go.tagjag.com/emoji in iTunes (.99c)
- Install and click through any story in the app.
- Go navigate through the iPhone’s Settings: General | International | Keyboards | Japanese | toggle Emoji to on
- SMS emoji graphics to anyone else who uses an iPhone – just click the globe symbol that should now appear in the SMS keyboard!
There’s also a way to do this for free (but in my estimation, it’s easier to just spend .99c on the app that’ll do it for you automatically).