You can restore content from an iCloud backup when your mobile phone is activated for the first time and after a factory reset. When this screen is displayed, your mobile phone is ready to restore content from an iCloud backup.
Tap Restore from iCloud Backup.
Tap the field next to "Apple ID" and key in the username for your Apple ID.
Tap the field next to "Password" and key in the password for your Apple ID.
Tap the required backup and your mobile phone restores the content of the selected backup. Subsequently, follow the instructions on the screen to set up your mobile phone and prepare it for use.