The iPhone 16 lineup is spearheading iOS 18's AI features, but it's not the only device compatible with the latest software update.
Apple announced a string of artificial intelligence (AI) updates to its operating systems in one of its most jam-packed WWDC keynotes this summer. For the iPhone, Apple unveiled iOS 18, the latest iteration of its smartphone software that is now available for download. The latest iOS includes enhanced AI integrations in Siri, generative AI capabilities in Photos and Messages (which are still to come), and updates to its Health and Calculator apps.
Apple removes one or two older iPhone models from its list of supported devices each time it releases a new iOS version, marking the end of those devices' software support cycle. Most of the newest AI features are reserved for the iPhone 15 Pro and the newer iPhone 16 models, as these features require the processing power of an A17 Pro chipset or later and 8GB of RAM or higher. However, iOS 18 is still available for many older models.
Also: 6 iOS 18 settings I changed immediately – and why you should too
We've added guidance below on how to trade in your old iPhone and more details about iOS 18 features. Here's the list of supported iPhone models that can benefit from the newest operating system.