Add URL of a website to Mobile Phone contacts.

Hi,

I am developing a multisite website where users can register for their personal website and then share with friends via SMS the URL of the website. Is there a way that when the friend receive the link, opens up the website, there can be a pop up prompt to ask them to tap to save the URL link of that website to an existing contact in the mobile phone? And if there is no existing contact, a prompt to create a mobile contact?

Please advise it there are plugins for this function or how to code for this?

Thank you.
Esther