What does it mean by 3rd mobile call to action?

The 1-800 number was the original mobile call to action, followed by the next mobile call to action a button or form fill on a landing page, and now Whisp has the 3rd mobile call to action that allows for a QR code scan routed to a text message that obtains the customer information without the form fill. 3rd Mobile Call to Action is the Whisp way of helping customers get started with your brand and get an offer or discount. By scannig or clicking and then sending the text message they will be instantly connected with you.