iOS 9, the mobile OS that powers Apple’s iPhone, iPad and iPod touch, got a significant update Monday (when Apple also unveiled a new 4-in. iPhone and a 9.7-in. iPad Pro) with the arrival of iOS 9.3. The updated OS introduces several new features, including new 3D Touch shortcuts for existing system apps, Wi-Fi call support for Verizon customers, the ability to encrypt individual Notes, and — most prominently — a new Night Shift mode that automatically shifts the white balance on newer iPads and iPhones to a warmer color spectrum to help reduce eye strain and improve sleep. iOS 9.3 also brings updates to CarPlay, as well as enhancements to make the iPad a better tool for educational use.