Android
Reset Advertising ID auf Android
Every Android phone carries an advertising ID, a randomized string that apps and ad networks read to build a profile of your habits. Unlike your device serial number, this ID is meant to be resettable, but most people never touch it, so it silently links activity across dozens of apps for years.
A new advertising ID does not remove existing profiles ad companies already built. It only stops them from adding new data under the old identifier going forward. Apps have to request the ID again after a reset, and some ad-supported apps may temporarily show less relevant ads until a new profile forms.
To reset it, open Settings ➔ Security & privacy ➔ Privacy ➔ Ads ➔ Reset advertising ID ➔ Confirm.
This setting lives under privacy controls rather than app permissions, so it is easy to overlook. If you are troubleshooting excessive personalized ads or want a clean break before selling or handing over the device, this is the right control. It will not fix location tracking or app permissions, those need separate adjustments.