iPhone 15 Pro and 15 Pro Max feature a new Action button as the biggest upgrade, replacing the traditional mute switch ring on regular iPhone models. The Action button can be customized so that it can be used as a volume rocker, to perform Shortcuts, activate Focus, open Accessibility features, and more. Besides, iPhone Pro features an Always-on display, and a new 48-mega pixel camera system with 5x optical zoom added as extras.