I would like it if you would create a No Reply option for SMS reminders.
I don’t want another mode of contact that people can send cancellations from and I don’t want to be charged for an extra SMS credit, to add a line saying “Please do not reply to this SMS”. It defeats the whole purpose and it is actually a really poor boundary to have in a business where communications can easily be lost. It makes people rely on this as a mode of contact.
There is the Jane App which I have come across which prevents customers from replying to an SMS reminder by preventing two-way SMS replies.