Open Settings on your iPhone
Tap your Apple ID name at the top
Tap iCloud
Tap iCloud Backup
Check that the backup you want is available
If needed, erase the iPhone by going to Settings
Tap General
Tap Transfer or Reset iPhone
Tap Erase All Content and Settings
Follow the setup steps until you reach Apps & Data
Tap Restore from iCloud Backup
Sign in with your Apple ID
Select the backup you want to restore
Stay connected to Wi-Fi until the restore finishes
Keep the iPhone plugged into power during the restore
Wait for apps, photos, and other content to download
If restoring from a computer backup, connect the iPhone to the computer
Open Finder on Mac or iTunes on Windows
Select your iPhone
Choose Restore Backup
Pick the correct backup
Enter the backup password if required
Wait for the restore to complete
Keep the iPhone connected until it restarts and syncs fully