Seth Godin says what we've all been thinking: "Am I the only person who wants a Hi Def telephone? A headset that sounds better than the handheld receiver"
It's true. Twenty years ago, a hard-wired phone line sounded just fine. After a bumpy start with the 40-50 Mhz bands, cordless phones started going places at 900 MHz in the 1990s, too.
Then our local EM fields got too busy, supposedly, for this wavelength to work well. Cordless phones moved to higher frequencies, which meant less interference--but the quality never seemed there, notwithstanding the cascade of technobabble printed on the boxes. I've owned at least a dozen 2.4 GHz and 5.8GHz models, but none have ever matched the audio quality of a Panasonic 900MHz model I still own to this day. In a house packed with strange EM fields, it sounds just fine, too.
Thence to cellphones. I thought Sprint was bad, but then I tried to make calls on my wife's iPhone. AT&T voice quality is just abysmal: it turns Apple's amazing handset into a joke about the inverted priorities of futurism.
So what do we do with this stuttering, fading echo of the human voice? We pipe it through BlueTooth, just to make sure it sounds as bad as it possibly can.