iOS 9.3 (build 13E5181f) is an official Apple over-the-air update for the iPhone 6s, released on 2016-01-14T18:01:26Z. The update package is 29.35 MB. This is a delta (partial) update that requires 9.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9d7e29d6a333b4fc82fa28dbe6e79739ffd2af5c.zip.