Ironically, being the last to deploy 3G in the United States has put T-Mobile in the position of having a really good 3G network in terms of what speeds can be supported. Its base stations are newer and support 64 QAM, allowing T-Mobile to roll out the 21 Mbps HSPA+ speeds without having to incur the huge cost that adding MIMO antennae to the towers would bring. But does adding MIMO to 3G at this point, as 4G networks are being built, make sense?
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