Apple fixes iOS 27 cellular download bug, but Wi-Fi still required

Apple has documented and fixed a bug that prevented iOS updates from downloading over cellular connections, with the fix included in iOS 26.6.2, but still requires Wi-Fi for downloading iOS 27. Apple's support documents, last updated September 9, 2026, confirm the cellular download bug fix in iOS 26.6.2, which must be installed first. The company's official instructions for iOS 27 explicitly list Wi-Fi as a requirement, with an alert message stating "This update requires a Wi-Fi network connection to download." Apple's troubleshooting guidance remains limited to deleting and redownloading the update or using a computer, with no iOS 27-specific support page published yet. The company has not addressed whether older builds face the same cellular issue or provided data caps or time estimates.