They're making improvements based on traffic and customer base. More T-Mobile customers in the area = faster upgrades.
The estimate is that in 2-3 years, their entire network will have 100% 3G coverage, but the cities and areas with the largest percentage of customers get the upgrades first. I can't say I blame them. Better to roll out a well-supported backhaul-efficient (unlike AT&T) network slowly than slap faster towers in an area and connect 'em to the same slow backhaul and then wonder why performance is lacking.
Give 'em time. It'll come.
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Current Apple Stuff: 24" iMac, iPhone 4, AppleTV (original), 4gb Shuffle, 64gb iPad 2.
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