iOS 18 brings a host of exciting new features for the iPhone, but not all will be available right away. According to Apple's website, some features like Mail categorization and Apple Intelligence functions will be introduced in later versions of the update, with iOS 18.1 and 18.2 rolling out in October and December respectively. The Mail app will add new categories for email organization and a digest view for emails from a single business. Apple Intelligence features will offer enhanced capabilities, initially with a "preview" label on iPhone 15 Pro models and newer. Moreover, Siri will be able to control robot vacuums through the Home app, with support for key functions like cleaning and mopping. In addition, the Home app will provide electricity usage information for select U.S. customers. Overall, iOS 18 promises a range of innovative features that will enhance the user experience on the iPhone.