T-Mobile will sell your web-usage data to advertisers unless you opt out.

Data sales begin April 26 unless you opt out; T-Mobile claims it'll be anonymous.

T-Mobile
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Jon Brodkin
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March 9, 2021
How to opt out of T-Mobile's creepy ad tracking campaign

The program collects information about the apps you have installed on your phone, how often you use them, which Wi-Fi networks you connect to and your web browsing habits and then sells that valuable information to marketers.

T-Mobile
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Jason Cipriani
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July 19, 2022