T-Mobile knows what apps you’re using. | Illustration by Alex Castro / The Verge

T-Mobile’s advertising business is offering a new way for marketers to pry into your app-using habits. Ad Exchanger reports that the un-carrier’s new program is called App Insights, and it’s now fully operational after spending a year in beta. The program allows third-party marketers to buy T-Mobile customer data and centers around a key piece of information that it has unique access to: what apps you use.

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