The new operating system is available to members of the general public with iPhones capable of running iOS 18. However, among those with older iPhone models, only iPhone 15 Pro, iPhone 15 Pro Max and iPhone 16 users can access Apple Intelligence features that are part of the iOS 18.2 update.
To download Apple’s latest mobile software, go to Settings on your iPhone, then General, then Software Update to download iOS 18.2. The software is only available in beta mode.