To import contact data from a CSV file to your iPhone, you must first import the data from the CSV file to a contact management program that is compatible with the iPhone.

Most email clients and Web-based services can easily export contacts as CSV files. Then you just need to import that file into Yahoo Mail to have all your contacts at your fingertips.

Then, browse to the .csv file you would like to import. Here, under Options, choose whether to replace duplicates (existing contacts), create duplicate contacts, or not import duplicates.

You can import more than 3000 contacts simultaneously though. If you are trying to import over 3000 contacts, try to divide them into several CSV files before importing.

Migrate Contacts from People App as a CSV file to Outlook Open Outlook app, click File and select Add Account option.

Here’s how it works. How to import passwords in iCloud Keychain You can import your existing database of usernames and passwords if you have it ready in a CSV file.