There is, of course, the caveat that HD voice (also called "wideband audio") is only available using specific smartphones:
To experience HD Voice, both parties on the call must use capable T-Mobile 4G smartphones such as the HTC One™ S, Nokia Astound and Samsung Galaxy S® III
TheNextWeb also suggests that the iPhone 5 should support HD Voice when T-Mobile makes it available on their network sometime this year.
Over on AnandTech, Brian Klug dives into a bit more detail about T-Mobile's HD Voice, specifically naming the AMR-WB codec, and relays some of his own testing that confirmed that it is live now.
This is an excellent step forward, even with the caveat that it only works on T-Mobile's 4G network and only with specific smartphones. As more and more people get used to the richer and better quality of wideband audio, expectations will rise and continue to push the ongoing migration of all telecom over to IP-based solutions.
Kudos to the technical teams at T-Mobile for making this happen!
P.S. I'm also personally pleased to learn about this because T-Mobile supports IPv6 across their mobile network, too. Now if only they could improve their coverage in southwestern New Hampshire, I'd be able to actually consider switching to them.
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