Unacast helps companies make smarter decisions and build better products through contextualized location data from the Real World Graph. Unacast is a registered data broker selling precise mobile location data. It offers an "Opt-Out & Do Not Sell" form linked from its homepage and privacy policy (exact URL not given in the text), and you can also email privacy@unacast.com or call 1-855-545-5623. Important: the opt-out only covers the specific device you submit it for, so you must repeat it for every device and again any time you reset your mobile advertising ID.