A vCard QR code carries a full contact card. Scanning it opens the phone's "add contact" screen with every field already filled in. It is the fastest way to hand over your details, and unlike a paper business card it cannot be mistyped.
It is the standard format phones and address books use for contact details. Because it is a standard, the scan works the same on iPhone, Android and desktop mail clients.
Only the ones you want to share. Every field you add makes the code denser and harder to scan from a distance, so if the code will be printed small, keep it to name, phone and email.
Not on a code that is already printed — the details are encoded in the image itself, not fetched from anywhere. Generate a new code when your details change.
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