advertising id

Hi all I read that the Advertising id can be rest by the user. But how to do it? Why I'm asking - for a long time I'm using this Advertising id in my project the id has never changed even if I remove the app from my phone and install it again - the id is always the same. The old id started...

Reading throught the code snippet on the link below: https://www.b4x.com/android/forum/threads/advertising-id.101050/ I am a little confused if we need to replace the admob unit id with the advertising id or there is no relation between both? I have checked the google link but still confused...