I haven't been able to get my hands on a 4S to try it for myself yet, but I'm wondering if Siri is able to recognize Hawaiian words (such as asking for directions to 1600 Kapiʻolani Blvd., Honolulu, HI for instance.)
Interesting question. I tried (even though I don't think I know how to pronounce it) and she couldn't connect to the network. Although I don't think she could have told me anyway since I'm part of the continental U.S..