Back up your iPhone to iCloud or a computer
Make sure your iPhone is compatible with the beta
Update your iPhone to the latest public iOS version
Sign in with your Apple ID
Enroll in the Apple Beta Software Program or Apple Developer Program
Open Settings
Tap General
Tap Software Update
Tap Beta Updates
Select the iOS 26 beta
Return to Software Update
Tap Download and Install
Enter your passcode if prompted
Agree to the terms and conditions
Keep your iPhone connected to Wi-Fi and power
Wait for the download and installation to finish
Restart your iPhone if prompted