This isn't obvious, 99% of apps make multiple calls to multiple services, and these SDK's are embedded into the app. How can you tell whats legit outbound/inbound? Doing a fingerprint search for the worst culprits might help catch some, but it would likely be a game of cat and mouse.
99.9% of app on app store connect to the network for a multitude of reason, do you really think only browsers connect to the internet? Do you not have an app on your phone?
