Turn on your iPhone and follow the setup steps until you reach the Apps & Data screen
Tap Restore from iCloud Backup
Sign in with your Apple ID
Choose the backup you want to restore from
Stay connected to Wi-Fi and power until the restore finishes
Continue setup and wait for apps, photos, and other data to download
If restoring from a computer backup, connect your iPhone to the computer
Open Finder on Mac or iTunes on Windows or older Mac
Select your iPhone
Click Restore Backup
Choose the backup you want
Enter the backup password if required
Wait for the restore to complete and keep your iPhone connected