https://arstechnica.com/gadgets/2018/07/apple-releases-ios-11-4-1-tvos-11-4-1-homepod-11-4-1-and-watchos-4-3-2/

Today, Apple released iOS 11.4.1 for iPhones and iPads—a small update that fixes a couple bugs and introduces a new security feature. This is the fifteenth update since iOS 11 released last September. It's available to the same devices as iOS 11.4—the iPhone 5S and later, the iPad Air and later, the iPad mini 2 and later, and 2015 iPod touch.

The notes users will see when they go to the Settings app to update their phones are as follows: