Apple releases iOS 11.3.1, improves security and fixes an iPhone 8 issue
The update is available for iPhone, iPad, and iPod touch, but for the time being, developers are the only ones that can download it. However, consumers should be able to get it very soon as well, so here is what you can expect from the new iOS 11.3.1 build.
First off, if you own an iPhone 8, this update addresses an issue where touch input was unresponsive on some units. The reason, according to Apple, is these faulty iPhone 8 devices were serviced with non-genuine replacement displays.
The changelog also mentions that iOS 11.3.1 improves the security of iPhones and iPads, so the more reason to download it as soon as it becomes available. Basically, aside from these security improvements, the most important thing is that it fixes issues with iPhone 8 third-party display replacements.
source: Apple via 9to5mac