Have no idea of importing CSV files to your iPhone? Do you want to transfer the contacts from Google, Outlook Express, Hotmail and more to iPhone?
From this video tutorial, you will find it is easy to import contacts (CSV & vCard) from Outlook, Google, Aol Mail, Thunderbird, Incredimail and other address books to iPhone with the help of iPhone Contacts Backup for Mac. This program also works well for iPhone 5 witho iOS 6. Just have a free try on it.
Video Demo:
http://www.youtube.com/watch?v=J8kxi6uFqrE