https://wccftech.com/iphone-13-models-do-not-have-noise-cancellation-feature-unlike-older-models/

Apple launched the new iPhone 13 models a few months back with a plethora of upgrades that made the flagship devices better than their predecessors. However, it seems there is one aspect where older iPhone models shine compare to the new iPhone 13 models. That's right. Apple has removed the noise cancellation feature for phone calls in the latest iPhone 13 models - a feature that all previous iPhone models had. Initially thought to be a bug, it is now discovered through Apple Support that Apple removed noise cancellation in iPhone 13 models.

A user shared the conversation he had with Apple Support on Twitter (via 9to5mac). According to the user “after working with Apple and a senior advisor for months saying to wait for an update to fix the issue, I got an update regarding the issue, and apparently, it won’t be fixed and noise cancelation is intentionally disabled for those devices for unspecified reasons.”