If your iPhone shows both iOS 18.7 and iOS 26 in Software Update, here’s the short version: iOS 18.7 brings bug fixes and security updates; iOS 26 delivers the major redesign and new features. You can review what’s new on Apple’s iOS page, then choose directly in Software Update.

Security: will iOS 18.7 keep me protected?

Yes. iOS 18.7 includes “important bug fixes and security updates.” Apple documents fixes on its rolling security updates page.

Note: for models that can run iOS 26 (e.g., iPhone 11), Apple typically maintains older branches only briefly; plan to move to iOS 26 in the near term for ongoing patches.

Compatibility

  • iPhone 11 (and newer) can install iOS 26 or iOS 18.7.
  • 2018 models (iPhone XR, XS, XS Max) remain on iOS 18.x and see iOS 18.7.

Storage: how much space do I need?

On-device downloads for major iOS updates are usually several gigabytes; temporary space during install can be higher. With a 64GB phone using ~52GB, free a few extra gigabytes before updating. The installer reclaims temporary space after completion; it does not permanently add the full download size to your usage.

Fast ways to free space (no data loss):

  • Offload apps in iPhone storage (Settings → General → iPhone Storage → Offload App).
  • Delete and reinstall cache-heavy apps (social, video) to clear app caches.
  • Review large Messages attachments (Settings → General → iPhone Storage → Messages → Review Large Attachments).
  • Move photos/videos to iCloud or a computer, then remove local copies.

Which should you pick today?

  • Prioritize stability and minimal change: install iOS 18.7 now; consider iOS 26 after a week or two.
  • Want the new design and features now: go straight to iOS 26 (free a few GB first).

How to proceed

  • Open Settings → General → Software Update.
  • Choose either iOS 18.7 or iOS 26. Keep the phone charged and on Wi‑Fi.

Practical tip for a 64GB iPhone 11 at ~52GB used: free 6–10GB, then install iOS 26 if you want the new features; otherwise take iOS 18.7 today and upgrade to iOS 26 when convenient.