What Is iOS 15? Everything You Need to Know

This article provides an overview of Apple’s iOS 15 operating system, exploring what the software is, its primary features, performance enhancements, and device compatibility. Readers will gain a clear understanding of how this update transformed the iPhone experience through smarter connectivity, redesigned system apps, and enhanced privacy controls.

iOS 15 is the fifteenth major release of Apple's mobile operating system, designed specifically for the iPhone and iPod Touch lines. Officially unveiled at the Worldwide Developers Conference (WWDC) in June 2021 and released to the public in September 2021, the update succeeded iOS 14. Rather than overhauling the visual interface, iOS 15 focused on improving daily usability, refining notifications, enhancing remote communication, and integrating on-device artificial intelligence. For more detailed guides and information, check out the iOS 15 resource website.

A major centerpiece of iOS 15 is Focus mode, an evolution of Do Not Disturb that allows users to filter notifications and Home Screen pages based on their current activity, such as working, sleeping, or personal time. Alongside Focus, notifications received a visual overhaul with larger app icons, contact photos, and a scheduled Notification Summary to prevent constant digital interruptions throughout the day.

Communication tools received significant attention in this release. FaceTime gained spatial audio, voice isolation modes, portrait mode for video, and the ability to share links with Android and Windows users. Later point updates integrated SharePlay, allowing users to watch movies, listen to music, and share their screens in real-time during FaceTime calls.

Other notable additions include Live Text, which uses on-device intelligence to recognize and extract text directly from photos and the live camera feed. Safari was redesigned with a bottom-aligned tab bar and tab groups, while Apple Maps introduced detailed 3D city views and interactive driving navigation. Additionally, iOS 15 reinforced user privacy with features like Mail Privacy Protection and on-device Siri processing.

iOS 15 supported an extensive list of hardware, maintaining compatibility with every device capable of running iOS 14, ranging from the iPhone 6s and iPhone SE (1st generation) up to the iPhone 13 lineup.