All iPhone users running iOS 13 or iOS 14 need to update now. Apple has confirmed routine browsing can trigger attacks on outdated iOS versions.
Unfortunately, most of these new features do not function on older Apple devices like iPhone 4, due to limitations. Some apps even require at least iOS 7 to work ...
Apple released iOS 26.3.1 (a) to fix a critical WebKit vulnerability (CVE-2026-20643). Learn how to enable Background Security Improvements.