This wikihow explains how to add everyone from your email address book directly to your iPhone’s contact list.
Open iPhone Settings . An app featuring a gray gear that you can find on any of the home screens. If it does not appear on the home screen, check the Utilities. folder.
Scroll down and tap Email . You can find it in the fifth part of the topic.
Click Account . This will show all the email addresses on your device.
Click the type of account you want to sync. Popular account types include Cloud, Gmail, and Outlook. Selecting one of the options will open a new page with several options on/off.
Move the Contacts button to the location “Active”. It slides to the right and turns green. Now everyone you saved to this email address book will also appear in your iPhone contact list.