If it only happens with the one specific person. It is some sort of issue related to them. WhatsApp has nothing to do with T-Mobile. You might want to try reaching out to their support though to see if they can look into what the issue specifically is. I’m aware that WhatsApp has nothing to do with T-Mobile, was just stating that because of the T-Mobile call quality issue I have to switch to that app solely when calling this party, which is annoying. Anyways, going to have them try contacting Apple and T-Mobile themselves. Oddly, I am also the only one they have this issue with on their side, too.
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