Eli5: why has the sound quality of phone calls improved so little over the last several decades despite us making technological advances in so many areas?
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Because it all has to work with the old equipment. As others said, you can get better quality with Voice over LTE where the voice gets digitally recorded on the phone and then transmitted over the internet where it is played back directly on the other phone. But with regular calls, they go through tons of other systems that were made decades ago and thye all need to be using the same standards to make sure that all the systems between you and the receiver can actually process the call.
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