it's switched on on mine, says "ambient noise cancellation reduces noise on phone calls in loud environments". Pretty sure this is not a new feature, only that it can now be turned on and off
Turning it off would disable the second microphone on your iPhone for noise cancellation meaning people on the other end of the phone will be able to hear background noise which can be pretty bothersome.
Turning it off would disable the second microphone on your iPhone for noise cancellation meaning people on the other end of the phone will be able to hear background noise which can be pretty bothersome.