If you're calling within the same carrier with "HD voice", AMR-WB at 12.65kbps scores a higher MOS than old-school G.711 64kbps PCM (and is more pleasing in some ways that the MOS doesn't capture).
Sure, if they'd just give us another couple dang kilobits/second it'd be way better still, but...
At this point, the bandwidth used for voice is pretty much irrelevant from a cellular capacity planning point of view-- people use >5GB/month on average and 24/7 12kbps calling is less than 5GB/month.
If you're calling within the same carrier with "HD voice", AMR-WB at 12.65kbps scores a higher MOS than old-school G.711 64kbps PCM (and is more pleasing in some ways that the MOS doesn't capture).
Sure, if they'd just give us another couple dang kilobits/second it'd be way better still, but...
At this point, the bandwidth used for voice is pretty much irrelevant from a cellular capacity planning point of view-- people use >5GB/month on average and 24/7 12kbps calling is less than 5GB/month.