The price point, coverage (native), and business model.. their voice quality is below that of some other carriers. With low spectrum holdings you can't really blame them for compressing it so badly. EV-DO network is slow. Low end phones, fees left and right, horrible customer service, shady dealers and to top it all off there are many other carriers that have a far lesser amount of fees, better coverage, voice quality, phone support, phone selection (BYOD and prepackaged devices) and wider range of plans..
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