The SMS Sign Up element allows you to provide users with a way to optin to receive SMS messages from you.
This provides users a way to give explicit permission to receive SMS messages from you.
Please note, just as with other ClickFunnels pages, an Email Address input field and a button set to #submit-form will still be required in order for this form to submit.
You can then set up SMS automations in your funnel or in Actionetics if you have integrated with Twilio.
After you have added the SMS Sign Up element to your page, you can change the style and text in the element, but the options to change the structure are very limited.
Please see the articles below for more information about setting up SMS messages to send to your users.