That mobile carriers know our location even without a GPS capable device, is no secret. Who else can use that information, and how they get to it, is another matter.

As it's often the case, there's a middleman in the process, and what it does raises concerns.

Mobile carriers find it too inefficient to ask for permission every time a company requires location information for a certain device, so they use third-party companies that pay for the information and handle individual permissions. This creates a barrier that prevents the carrier from knowing what the information is used for, ...


원문출처 : https://www.phonearena.com/news/US-carriers-have-a-loose-grip-on-users-location-information_id106749