First time I've heard of this. It is possible to turn it off though. > note that when ad tracking is limited, the value of the advertising identifier is 000000

First time I've heard of this. It is possible to turn it off though. > note that when ad tracking is limited, the value of the advertising identifier is 00000000-0000-0000-0000-000000000000 https://developer.apple.com/documentation/adsupport/asidentifiermanager https://developer.apple.com/documentation/adsupport/asidenti... Here is how you turn it off: 1. Go to Settings > Privacy > Advertising. 2. Turn on Limit Ad Tracking. https://support.apple.com/en-us/HT202074 https://support.apple.com/en-us/HT202074