iOS 12.1.3 (build 16D39) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2019-01-22T18:14:21Z. The update package is 510.14 MB. This is a delta (partial) update that requires 12.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 01909c9728d1f9f8c84b5de1a6b63bb5fd05e5cd.zip.