"If you're a Verizon, AT&T, or T-Mobile customer, you might be surprised by how much information you agree to share with your provider the moment you sign up. Some of this is expected, such as your Social Security number, home address, and payment details. Beyond that, carriers also enable settings that allow them to collect data from your web browsing, location, and more. While they do not directly access this information themselves, it is used to build advertising profiles and personalize your experience."
"It is also not just for internal use. The big three carriers share, and in some cases sell, personal information to other companies for targeted ads or credit checks. When you consider the steady stream of high-profile security breaches carriers have faced in recent years, it is understandable if the idea of handing over even more data makes you uneasy."
Major U.S. carriers collect both expected account details (Social Security numbers, addresses, payment information) and additional data such as web browsing and location. That data is used to build advertising profiles and personalize customer experiences and is sometimes shared or sold to other companies for targeted advertising and credit checks. Repeated high-profile security breaches increase the risk associated with such data collection. By law, carriers must offer opt-outs for certain types of data sharing, and each major carrier provides some opt-out options, but the available choices vary and some settings may be enabled by default. Users should review privacy and security menus regularly.
Read at Android Authority
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