Dave Ligthart

Import users from vcard as subscribers. 
Works with populair websites such as linkedin and gmail.
Notable features:
<ol>
<li>Import users from vcards as subscribers to your website.</li>
<li>Import user contact data from populair websites such as linkedin and gmail.</li>
</ol>

WP-vCard

Import users from vcard file format. Works with populair websites such as linkedin and gmail.

stasionok

Qbein

Plugin Generate QR code in vCard or MeCard format with your contact information.
Share your contact information such as emails and phone numbers and much more through QR code with WordPress using shortcode, widget or everywhere else by direct link.
That plugin use MeCard format and vCard version 3 format as most compatible and frequently used.
You can read detailed information about vCard <a href="https://wikipedia.org/wiki/VCard" title="Wikipedia about vCard" rel="nofollow ugc">here</a>, and about MeCard <a href="https://en.wikipedia.org/wiki/MeCard_(QR_code)" title="Wikipedia about MeCard" rel="nofollow ugc">here</a>.
<h3>How to increase photo size in QR code vcf file</h3>
You can override qr-code thumbnail with following code in your theme functions.php file 
 `add_action( ‘after_setup_theme’, ‘change_qr_code_photo_size’ ); 
function change_qr_code_photo_size() { 
 // Override the image size 
 add_image_size( ‘qr-code-photo’, 600, 600 ); 
}“`

QR code MeCard/vCard generator

Share your contact information such as emails, phone number and much more through QR code with WordPress using shortcode, widget or by direct link.

WP-vCard vs QR code MeCard/vCard generator