Both Manual and Direct method to import CSV Contacts to iPhone device are available. In the Manual method, you need to go for another email client as these email clients offer the option to import CSV contacts first and using itunes account, user can migrate them into their iPhone Device.
Follow below steps to import CSV Contacts to iPhone using iTunes.
In Outlook Application, Within Import option, “Import from an External program” and import your CSV file. After that you need to map the attributes the CSV Filed values with the vCard attributes so that when you import the vCard files using iCloud Account then no field values should be misplaced.
Now Open your iTunes account and Go to “Info” section and Select “Outlook” account.
Now Open your contacts,list your are view CSV contacts into your iPhone 6 and other editions of iPhone.