Most carriers will get it eventually. As far as I know cingular and vodaphone will be launching it first. T-mobile will follow 30-60 days after cingular in the US. Verizon and Sprint will launch a 'worldphone' version around midyear.

What lack of coverage in the financial district are you talking about? I suspect your issues might be phone or building related as t-mobile has great coverage in that area. Make sure you try a cingular phone there before you jump ship, If it is an issue related to the building you are in you might not see an improvement.