How was Emoji programmed?
I’m assuming the app downloads and installs a language pack in the core operating library? Then the app simply instructs the user how to enable multiple languages..
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In short – it isn’t.
iOS always had emoji built in, but it was hidden by default on non-Japanese phones (I believe this may have changed in iOS 5.0). Emoji “installer” apps are just invoking some undocumented functionality in the OS which makes it start showing up.