Overview

• Released on September 15 for iPhone 11 and newer, the software brings the Liquid Glass redesign and features like call screening and live translation, with a large download reported at over 14GB that may require ample free storage.
• Early adopters describe faster battery drain, warmer phones and UI lag, with mixed reports from older supported models and widespread criticism of the new visual style’s legibility in dark mode.
• Apple’s support guidance says major updates trigger background indexing and asset downloads that can temporarily impact performance and thermals, with issues typically settling after a few days.
• Apple lists 26 security fixes across components including WebKit, Kernel and the Apple Neural Engine, and security specialists such as Jamf urge prompt installation to reduce exposure to vulnerabilities.
• Mitigation advice includes restarting, freeing storage, updating apps, reducing motion and transparency, resetting settings, or temporarily downgrading or staying on the iOS 18.7 security path if stability is a priority.