What is a Google Advertising ID?
Android users are each assigned a specific anonymous identifier by the device for use in advertising. This Android function cannot be turned off, but you can reset it and create a new, random Google advertising ID at any time.
How can I reset my Google Advertising ID?
Open the menu on your phone by tapping on the menu icon which will display your apps list. Then find and select Google Settings.
On the next screen tap on "Ads", then select "Reset advertising ID". A pop up will come onto your screen then you tap on "OK" to consent to creating a new Google Advertising ID. Once you tap "OK" you will generate a new Google Advertising ID which will be displayed on the bottom of your screen.