How do I invite someone to opt-in to receive text messages? July 26, 2019 15:02 Add them as a contact to your Simply Text account When you’re adding them, on the top right of the contact card you will see “Send this contact text/SMS messages?” with a checkbox below it. Check the box, and click “Save” on the contact card. Related articles How does someone opt-in to receive text messages? What do the different statuses (letter C's) of my contacts mean?