Text messages — Opting out

The first text RowFold sends to a number says how to stop. Later ones don't repeat it, and replying STOP to any of them still works: it stops them immediately, and START resumes them. Opt-outs are held against the number itself, so somebody who stops is stopped everywhere at once rather than having to repeat it. That's deliberate: texts go out on a sender identity shared across RowFold, so one person's opt-out has to mean something globally.