KNTV NBC Nightly News With Lester Holt December 20, 2019 10:15:00
>> you have all of these data points and you can put them all together seamlessly, you can actually figure out who it is it's very difficult to keep it anonymous. >> reporter: so what can be done short of turning your phone off altogether go into your privacy settings and manage location services. the other thing you can do is disable something called the mobile ad i.d. this is a unique code that every phone has the collection and selling of the location data for now is completely legal and totally unregulated. stephanie gosk, nbc news, new york >> a lot of us will be checking those settings t...