Sending a survey by SMS: does it work?
SMS gets a higher response rate than email, but only if you keep the question small. A questionnaire by SMS does not work.
One question
For example a score from 1 to 5, answered with that number. Anyone wanting more puts a link to a short page — but should then expect fewer answers.
The right moment
Shortly after the experience, not days later. An hour after a visit or a delivery is the sweet spot.
Say how long it takes
"One question, one answer" raises the response rate more than any wording.
Do something with the answer
Anyone giving a low score deserves a response from a human. A survey without follow-up is worse than no survey: you asked and did nothing.
Do not overdo it
One question per visit, not per purchase and not per contact. Anyone surveyed after every interaction stops answering — and opts out.