fun with unique mobile identifiers
I rooted one of my Android phones and was able to modify the unique identifiers inside each factory installed application inside the shared preferences location of the apps in the /data/data directory.
I was able to modify each unique identifier on all the apps individually and they would stay modified as long as I did not allow the Play Store app to update the apps.
All except for one factory installed app of course.
This one factory installed app would always revert back to the original unique identifier by itself and seemed it could bypass the Google Play Store altogether.
I'll give you only one guess as to which factory installed app that was.