I am an instructor of classes that only run for 1-4 weeks. The facility I teach at requires me to include my cell phone number on the class schedule that I give out (however, I believe they would be ok if I didn't give a number if I gave some other means of contact). However, during and after the last class I taught I received 250+ texts from one of my students. Only about 5 or so were specific questions relating to the class, about 70% were asking for me to come up with questions to test them, and the rest were trying to make chit chat.
Is there some website or app that I could use so that my students have a way of contacting me only during the class and I can shut down/stop/prevent any communication after the class? The classes are usually mostly/all teenagers so I need a website or app that where I can send/receive messages from my smartphone (Samsung) or computer, but will work for the students that don't have a smartphone yet.
Just adding all of their numbers to a spam list after the class is not an option because some of them become co-workers if they pass the class (so they may need to be able to contact me via phone--my work posts everyone's numbers in our break room--to trade shifts, etc.).