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Not sure but I was wondering this too. I swear during the keynote I thought they said you'd be able to use your native language. My wife is from Japan, and she'll have a 4s in February.
 
Currently, Siri is available only in English, French and German. But I'm sure when other languages become available, we'll be able to use them no matter where we bought our iPhones, just like we are able to use any available international keyboard on all iPhones.
 
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