iOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2018-03-29T17:13:31Z. The update package is 841.42 MB. This is a delta (partial) update that requires 11.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4ff55d81954fae3a36ba4fbf3de7ca04ca041bb4.zip.