- An SMS confirming my appointment.
- An SMS the day before reminding me of the appointment.
- An SMS the morning of the appointment inviting me to checkin.
- An SMS after I left asking me about my experience on a scale of 1-5.
That's four SMSs relating to one appointment/visit. The moment I read this post I could just imagine a similar situation - I make a reservation online for a table, and I'll get spammed indefinitely about offers, and invitations to leave a review.