That is the idea behind the second microphone we will see how well it works with the Evo LTE once we get it.
As far as the HD Voice the tech behind it is called Wideband Audio and not only do both phones have to be using it but it is not native to to the network so Sprint has to deploy it market by market(Assuming they already are with Network Vision upgrades)so it will be a while before we really get to test it. Here is an article explaining the science behind it:
From the Engagdet test, it sounds like both sides need to have HD Voice. The idea is that it does ambient noise cancellation with the second mic, but this audio stream is "encoded" by your phone and only "decoded" by the receiving phone. I can only imagine that all to be a bunch of bs, but who knows, maybe its really just a digital stream of audio at some increased bitrate compared to a "regular" voice call. Sprint will supposedly be using this on a bunch of new handsets coming out soon...but that's all conjecture until we see the EVO Shift 4G LTE+ with more LTEness.
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