1 hour, 13 minutes, 48 seconds is all it takes to confirm what a lot of us know already: customer support is useless when the issue at hand is anything other than trivial. Generally, I haven't had any problems with T-Mobile support, but in this case the tech support turned out to be utterly lacking, despite their best efforts and educated guidance from my side.
And it is really surprised given the multitude of nations that comprise the US population, and the fact that a lot of people speak more than one language, and quite some more than two.
And the question was really, really simple: how to add Cyrillic input language support. Doesn't get much simpler than that.
It is even more infuriating because I know that it is possible, and all the T-Mobile rep is saying is "you have to purchase the application to do that", and when I ask "what application should I purchase?" his answer is "It doesn't say it here". I don't have a personal grudge against him - it's simply beyond his training, but the T-Mobile the carrier could've paid more attention to such a simple issue.
Oh well, GIYF... Off investigating.
UPDATE: BlackBerry Curve Add Input Language HOWTO.