Behavior of introductory price for IAP on pre-iOS 11.2 devices

Question

If I set up an introductory price/free trial for a recurring subscription IAP, what happens when a user on e.g. an iOS 10 device initiates the IAP flow in my app? Obviously the introductoryPrice object won't be available on the SKProduct, but does Apple say whether the user will be charged the normal price or the introductory price?

Answer 1

For users below iOS 11.2 they won't see any introductory offer and will be charged the normal subscription price immediately.

Source: Testing this in production, couldn't find Apple docs on this either.