Your #Android phone has a so-called Google advertising ID*, a unique number for your device. Using that, #tracking companies follow and record what you do on your phone, even across apps from different companies.
Luckily, you can now disable the advertising ID to make it harder for them to track you. We recommend doing this to everyone. Here's how it works.
*Unless of course, you’re using a google-free #LineageOS, #GrapheneOS or similar. :)