If you're using iOS 7 or later, follow these steps:
- 
	
- Tap Settings > Mail, Contacts, Calendars > Add Account > Google. 
	
- Enter the required information in the fields. 
	
- Make sure that Contacts is on. 
	
- Go back to your Home screen and tap Contacts. Syncing should begin automatically. 

If you're using iOS 5 or iOS 6, follow these steps:
- 
	
- Tap Settings > Mail, Contacts, Calendars > Add Account > Other > Add CardDAV Account. 
	
- Enter this information in the fields:
	
- 
		
- Server: google.com 
		
- User Name: your full Google email address 
		
- Password: your Google account password 
	

	 - Under Advanced Settings, make sure that SSL is on and the port is 443, then tap Next. 
	
- Go back to your Home screen and tap Contacts. Syncing should begin automatically. 

If you get a username or password error, you might need to generate an app password for your iOS devices.
Go to Google website to learn more about syncing with Google contacts.