An interesting tidbit: At least early on in 2008, for emoji to work both the sender and the recipient had to follow the instructions. So the toggle wasn’t just about adding a keyboard, but also enabling the decoding and rendering. (And complicating things further, iPhone’s Japanese keyboard had emoticons, and that keyboard was widely available without any hacks. The difference between emoji and emoticons was not obvious to many people, leading to a lot of extra confusion.)
The universal cover of a doughnut，这一点在PDF资料中也有详细论述
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