Why facetime audio is so much better than making a mobile carrier phone call

I kept struggling to figure out why technically facetime audio is so much better that making a Mobile phone call.

At last I found the explanation.

AAC-ELD audio protocol an AAC-LD based technology.

See:

https://en.wikipedia.org/wiki/AAC-LD

http://www.mpeg-audio.org/docs/w15073_Technical_Note_AAC-ELD_ImplementationGuide.pdf

FaceTime Audio: The Beginning or The End?

I can’t understand my Dad on mobile however on facetime audio he is very clear.

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