@constantine, you need to get that phone unlocked and that could cost some 500 bucks at the max. Also, you can't do firmware upgrades as they will again lock your phone to T-Mobile USA and render it useless (which means you need to spend another 500 bucks for unlock)
btw, how much are you paying for this?
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also, checked Sidekick 2009's specs and I am not at all impressed (except for the display's resolution). The OS/inerface looks a bit weird. My pick would be HTC G1 atleast which is not available for some 225$ or HTC Magic or HTC Herofor $350 approx.