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Story summary
- Apple recommends 18–25 GB free storage before installing iOS 27.
- iOS 27 requires at least 50 % battery, though plugging in the iPhone is safer.
- A continuous Wi-Fi connection must remain active during download and installation.
- Enabling Automatic Updates lets iOS 27 install overnight while charging on Wi-Fi.
- Installing iOS 26.6 first eases the transition to iOS 27’s Siri changes.