iOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPhone 7 (Global), released on 2018-03-29T17:13:16Z. The update package is 1.4 GB. This is a delta (partial) update that requires 10.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6bef196836f8e99f8f720433acebaeb70bd04534.zip.