Text notifications can be helpful to keep you updated on important events, but they can also become a nuisance if you receive too many of them. Fortunately, opting out of text notifications is usually a straightforward process.
If your students want to stop receiving text messages, they can opt-out by replying to the text message with the word "STOP". This will stop all future text notifications from you (the sender).
If they want to start receiving text notifications again, they can reply with the word "UNSTOP". This will opt them back in.