Apple's iOS 18 is set to arrive soon, bringing a host of game-changing features to your iPhone. The much-anticipated update will launch alongside the iPhone 16 at a special event on September 9, with the software rolling out to other devices shortly after. While many iPhone users prefer to wait before updating to major new operating systems like iOS 18 to avoid early bugs, there are compelling security and privacy reasons to consider updating immediately. Below, we explore three reasons to update to iOS 18 as soon as it arrives next month, as well as one reason you might want to hold off.