iOS 12.1.3 (build 16D39) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2019-01-22T18:14:18Z. The update package is 1.49 GB. This is a delta (partial) update that requires 11.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b61d8a7d6c903e8f2efe51034ba9c3e5e6e5685a.zip.