On April 1, April Fool's Day, Apple quietly upgraded the latest iOS 9.3.1. This upgrade is aimed at correcting some crash bugs of iOS 9.3, with a small update range.
This upgrade is aimed at correcting the bug that crashes in many iOS built-in applications such as Safari, Mail and Messages in iOS 9.3, so that users will not have to suffer any more. For iPad Pro 9.7-inch and iPhone SE users, they can immediately push and upgrade the new device as soon as they get it. Apple is still very quick to solve the problem.