Tectite Formmail - php email form to text message

I have built a php form which sends form responses to my email and phone as a text message

If I reply to the email, the response will be sent to the person that filled out the form

However, I don't have the same functionality with text message form responses

I assume and hope its a very simple fix --

I need to REPLY to a form response which is delivered to my phone as a text message, and have my reply text be sent to the person that filled out the form