Tag Archives: tracking

The Lowdown on Phone Carrier UIDH Injection

Over the past few days, media outlets have been reporting that Verizon has been inserting a string of letters and numbers called a UIDH into outgoing http requests made by its customers. The string uniquely identifies a specific device. The diagram in Jonathan Mayer’s blog post provides a good picture of how the process occurs and how this string can be used. Basically, a website that receives the string can pass it along to an advertising exchange which in turn pays Verizon for information on the subscriber that allows them to show more relevant ads.

Mayer’s post states that at a minimum, Verizon reveals Continue reading The Lowdown on Phone Carrier UIDH Injection