iOS 12.1.3 (build 16D39) is an official Apple over-the-air update for the iPhone 7 (Global), released on 2019-01-22T18:13:09Z. The update package is 1.46 GB. This is a delta (partial) update that requires 11.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: bb1600107ccb7f76500a58c26652f1661debd920.zip.