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Wirelessly posted (Sprint Touch Pro 2: Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 8.12; MSIEMobile6.0) Sprint T7380)
Even though the EvDO Rev.x standard and 3gpp2 standards allow for voice calls & SMS to be transported via Ev, the carriers never implemented it due to the immaturity of voice over mobile IP at the time, specifically latency & available bandwidth variations combined with the lack of a vocoder which could compensate for this using the processing power available in devices.
This is, in my opinion, why Sprint should have implemented EvDv like their original plans were instead of wavering to Verizon & other carriers who decided to use EvDO. They would have much lower RF overhead.
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