Plumbing
Most plumbing work is urgent, and urgent means the caller keeps dialling until somebody picks up.
Water on the floor is not a decision, it is an emergency. Nobody with a burst pipe leaves a voicemail and waits — they hang up and call the next name on the list. The call you miss is a job somebody else does within the hour.
A typical job is a four-figure ticket, which changes the arithmetic of answering. Missing one is not a rounding error against overheads; it is the overheads.
An emergency search shows a row of names and a row of star ratings. The finished job that never turns into a review is a rating you already earned and never collected.
A call that rang out gets an automatic text back.
Scheduled follow-ups to an enquiry that went quiet, more of them on the higher plans.
Asking for a review after the job, with the link that takes one tap.
Booking that writes into a real calendar and shows the slots you actually have.
A voice that answers the phone on the top plan.