It might vary depending on the operator that you use. eg - whether they are using hd voice speech codecs or not and how they have implemented VoLTE (voice over LTE) in their network. The types of calls you are making, etc.
eg - My vague understanding, in many implementations, both the calling party and the called party need to be on VoLTE for both ends of the call to be using the higher bandwidth speech codecs.
if one party is not on VoLTE, then it's just a regular low bandwidth speech call on both sides and you probably won't notice much of a difference.
Some of the nuances of my vague understanding could change over time as technology advances, so I could be way off base.
Either way, my point is that your experience will vary heavily depending on your choice of operator, and there is no simple one size fits all answer to your question.
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