For sending SMS, you must have at least 1 phone number element in your form.
You can select any number of submissions and send an SMS to those submissions.
Here's how to send an SMS as a response :
Go to the Submissions page and select the submissions you want to respond to.
Click on the Take Action drop-down button in the subheader.
Click on the Send SMS option from the dropdown, which will open a form in a pane.
Select a predefined SMS template or compose an SMS from the pane.
Click on Send to send the response SMS to all submissions with a valid phone number.
⚠️ For sending SMS, ensure that you have enabled Twilio integration.
FAQ
Are the SMS reminders not being delivered?
Please cross-check the error code with the codes listed on this page.
If the error is "Verification required to continue using the Toll-free number", you can follow the instructions from the dashboard to verify the toll-free number: https://console.twilio.com/us1/develop/sms/overview
Here is Twilio’s help doc for it: https://help.twilio.com/articles/5377174717595-Toll-Free-Message-Verification-for-US-Canada