If you want to activate or deactivate noise cancelation (or transparency mode) mode through the control center of your iPhone or iPad then follow these instructions written below: -Go to the control center of your iPhone. Now there can be two ways, if you are using a face id phone then you will need to swipe down from the top of the screen (in a diagonal manner) and if you are using a phone on a touch id then you will have to do complete opposite that is swipe towards up from the bottom part of the screen.  -Now, you will have to hold the volume adjustment button (hold it on the bottom) and you will get the option for the icon of AirPods Pro -Then you will see three options there that are of transparency mode, noise cancelation mode, and off. Select the option of your choice, and you are done.