The phrase refers to the range of Apple iPhone and iPad models that will be compatible with, and able to run, the iOS 18 operating system. It identifies the specific devices slated to receive the software update. For example, a potential list might include iPhone 15, iPhone 15 Pro, iPhone 14, and certain iPad models.
Compatibility is crucial as it determines which users can access the latest features, security updates, and performance improvements offered by the new operating system. Historically, newer operating systems have not been available on older devices due to hardware limitations, resulting in users needing to upgrade their hardware to stay current with the software. This compatibility also directly impacts app developers, who must ensure their applications function correctly on the devices supporting the new OS.