This is part of the backbone of how the Internet works. Here's an example of the header generated when I visit Android Police: It provides some information that helps the server choose the correct version of the page, such as what browser and operating system you use. An HTTP header is part of the information your device sends to the server of the website you're visiting its main function is to ask for the server to send the webpage to your computer/phone/tablet. It is what they call a "unique identifier header" (UIDH), a code injected into the HTTP header for each page you request while browsing on their network. Technically speaking, what Verizon is using is not a cookie or supercookie or any kind of baked good.
Now, recent reports show that at least one third-party ad agency has been using Verizon's supercookie to track users after they have deleted cookies or opted out of data collection. The injected data has been called a "supercookie," a term that reflects the fact that it is not removable like a tracking cookie. Not only that, but their method to ensure that you can't navigate around it makes your unique identifier visible to every website you visit. If you are using data as a Verizon Wireless customer, Verizon is tracking you.
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