Apple has baked a new privacy feature into iOS 11.3, the latest software update for its iPhones and iPads. Following the update, a new icon will appear each time personal information is required to enable a service providing users with a new layer of transparency over how their data is handled.
https://www.notebookcheck.net/Privacy-feature-in-iOS-11-3-lets-users-know-when-it-wants-your-data.293604.0.html