Not sure which version of mail you use? Learn how to change between basic and full mail
From AT&T Mail
To save a contact from an open email, select + Add to contacts.
From basic mail
Want to add all your contacts from another email account? It’s easy to import that info from Google, Outlook.com, or Yahoo! Mail.
From AT&T Mail
Good to know: Want to add a contact file from an email program? You can save your address book from an email client like Microsoft Outlook or Apple Mail as a .csv or .vcf file. AT&T Mail supports both file types. Check with your email client manufacturer for more info.