At yesterday’s iPhone event, Apple’s Vice President of Worldwide Marketing had announced that iPhone 5 supports wideband audio, which is commonly known by carriers as HD voice. It extends the frequency range of audio signals transmitted, resulting in  crisper word clarity and more natural sounding speech.
Schiller had briefly mentioned that the feature will be supported by 20 carriers worldwide at launch. It was assumed that the feature will be available on Sprint, as it was the only carrier in the US that supports HD voice protocol.
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