In three days, Apple will be hosting its Glowtime event to announce the new iPhone 16 lineup with iOS 18 already installed, eliminating the need for an upgrade at purchase. However, older phones not included in the new iPhone lineup may find themselves unsupported by Apple as certain models become excluded from iOS eligibility lists each year. If your device is compatible with iOS 18, you can continue using it without needing to buy a new phone for access to the latest software features. Older devices may miss out on Apple Intelligence beta testing, requiring a top-end 2023 model for eligibility. While Apple Intelligence is the standout feature of iOS 18, additional updates like a passwords app, improved Messages, organized photos library, and personalized home screen layout will be available to select iPhones. The new software features are expected to roll out gradually over the next few months, with some features limited to the iPhone 15 Pro series. An iOS 18 beta is currently available for download, but waiting for the official release in a few days is recommended for a smoother experience.