i sent the text and didnt get a response
Works fine tested it special for you.
Make sure your sending a text to number 711711 and in the body of the text write "red", if that doesn't work try texting the word "stop" and then again "red".
Curios to know what service provider your using? I remember years ago It used to be some phone services didn't allow you to send a short code message but I didn't know that exist still today.
Like chacha only worked on some phones.