iOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPhone 7 (Global), released on 2018-03-29T17:13:19Z. The update package is 791.98 MB. This is a delta (partial) update that requires 11.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6cddd6da62172a86aaa1fba8fae7dd315f7fe00d.zip.