iOS 11.2 (build 15C114) is an official Apple over-the-air update for the iPhone 6s, released on 2017-12-02T08:14:22Z. The update package is 1.12 GB. This is a delta (partial) update that requires 10.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 396d7547e6e1ec7b4b9e536bcaaa068baeb38f23.zip.