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How to install the iOS 18 public betas
Try new iOS 18 features before they’re released!
Also, the fun of trying features early comes with the potential thrill of stability issues and excessive battery drain. There’s also an on-device “semantic index” that carries out requests with the context of personal data, like knowing to scan your messages, emails, and calendars for details when you vaguely ask, “What time is dinner with Mom?” If you’re not, visit this link and click Sign up — and be sure to use the same Apple ID as the device you want to run the beta on.
Or read this on The Verge