- Open the Settings app.
- Tap Privacy.
- Scroll down to the bottom of the page and tap Advertising.
- Be sure that Limit Ad Tracking is set to Off.
- Tap Reset Advertising Identifier..
- When prompted, tap Reset Advertising Identifier.
Android:
Step 1: Open Google Settings on your Android device by tapping on menu and then on Google Settings once all apps are displayed on the screen.
Step 2: Locate and tap on the Ads menu under Services.
Step 3: Tap on "reset advertising ID" on the new page. ...
Step 4: Confirm the reset when the confirmation prompt is displayed.