![AppleInsider on Twitter: "Apple's #iOS15 update is now installed on 72% of iPhone models from the last four years, lagging behind the adoption rate of iOS 14 at this point after release. AppleInsider on Twitter: "Apple's #iOS15 update is now installed on 72% of iPhone models from the last four years, lagging behind the adoption rate of iOS 14 at this point after release.](https://pbs.twimg.com/media/FJAJhTEWQAcPPAy.jpg:large)
AppleInsider on Twitter: "Apple's #iOS15 update is now installed on 72% of iPhone models from the last four years, lagging behind the adoption rate of iOS 14 at this point after release.
![iOS 15 Concept Envisages Split Screen Multitasking, macOS Big Sur Icons. Widgets on Lock Screen, More iOS 15 Concept Envisages Split Screen Multitasking, macOS Big Sur Icons. Widgets on Lock Screen, More](https://cdn.wccftech.com/wp-content/uploads/2021/05/iOS-15-concept.jpg)
iOS 15 Concept Envisages Split Screen Multitasking, macOS Big Sur Icons. Widgets on Lock Screen, More
![Apple's latest iPhone software, iOS 15, is rolling out. Here's what you should know. | The Seattle Times Apple's latest iPhone software, iOS 15, is rolling out. Here's what you should know. | The Seattle Times](https://images.seattletimes.com/wp-content/uploads/2021/09/09212021_apple15ios_011417.jpg?d=1560x866)