1. Read About
- Settings → General → About.
- iOS Version. Example: 27.0.
- Tap the version if you need the build number (More Details on Software Update also shows it).
2. Do not trust the download title alone
Launch-week Software Update sometimes labeled the 27 payload as 26.7. After reboot, About is correct. See upgrade shows 26.7.
3. Match it to the model
Same iOS on two phones does not mean the same features. iPhone 13 on 27 has no Siri AI. Check the compatibility checker.
Do not do these
- A beta profile can show 27.1 or 27.2 while public is still 27.0. VPN & Device Management tells you if you are on a beta channel.
Questions this page actually answers
Where is the build number?
Software Update → More Details, or tap the version on About on current iOS.
Next useful pages
Sources
- Apple Support: How to download iOS 26
- Apple Support: Back up your iPhone
- Apple iOS 27 compatibility list
Prepared by the iPhone Update Editorial Desk. Independent technical reference. Not affiliated with Apple Inc.