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I've got a Canadian DS, a UK charger, and US, UK & Japanese games.... everything works absolutely fine with each other. No problems with wi-fi or anything like that.
Me and the missus' (has a UK DS) have even had wireless link up's with the various combinations of the region stuff, no problems at all.
most portables are region free, they would be no point in making them region locked. i believe production of the umd films is stopping soon, because they just are not selling well