PHOENIX - It has become an annual tradition of sorts for Apple users, but in a matter of months, people with devices running iOS will be updating to a new operating system.The new operating system, iOS 16, was announced during apple's World Wide Developer Conference (WWDC) in June.Here's what you should know about Apple's upcoming iOS.iOS is the operating system that runs on Apple's iPhones.While Apple regularly issues minor updates for iPhones, they also release a new version of iOS once a year, and iOS 16 is a new version of iOS.According to Apple, there are a number of changes for iOS 16, but two major changes include lock screen customization and recalling sent messages.A look at the new, customizable lock screen on iOS 16.