Used to travel a lot to Seattle when I was at Amazon which was the reason why I continued to use my A1303SA for so long. The A1303SA was the only phone at the time from AU that could be used in Japan, parts of Asia and the US. But for some reason, Japanese phones that could be used in Japan and overseas were really (and still are) crap in terms of functionality.
I've always wanted a better phone but thought that I should be practical and stick with my crap A1303SA but then after a few years, Japanese phones with removable sim cards started to come out - yep - what has been the norm outside of Japan has not been in Japan. I'm not sure even if my old AU had a sim card inside - even if there was, it was probably welded down and shielded in 3 mm thick amber.