Most owners I meet have never called their own business. Not once. They know the website, they know the booking system, they know the team. But they have no idea what a stranger hears when they ring the main number at 10am on a Tuesday, or at 7pm on a Friday.
That gap matters more than it sounds. The phone is often the first real conversation a customer has with you. If it rings out, goes to a full voicemail, or ends with a callback promise nobody keeps, the customer does not see a busy team. They see a business that did not want them.
What researchers find when they call
Health researchers have a name for this test: the secret shopper study. Callers pose as ordinary people trying to book, and they write down exactly what happens. The findings are useful for any business, not just clinics.
In a 2024 study in JAMA, callers posing as patients rang 320 psychiatric clinician offices across four large US cities, all listed as accepting new patients. Only 87 of them, or 27.2%, had an appointment available. Among the clinicians without an appointment, 15.2% had an incorrect or out-of-service number and 35.0% did not answer after two attempts[1].
27.2%
of 320 offices called had an appointment available[1]
35.0%
of clinicians without an appointment did not answer after two attempts[1]
15.2%
of clinicians without an appointment had an incorrect or out-of-service number[1]
Think about that last number. These were offices listed as open to new patients, and some of them could not be reached at all because the number was wrong. Nobody inside the business would ever notice, because the calls simply never arrived.
The callback promise that quietly breaks
A 2023 secret shopper project by the University of Kentucky Center on Drug and Alcohol Research tested treatment centres the same way. During business hours, 88.4% of calls to community mental health centres ended in an appointment. After hours, only 10.7% did, and 82.1% of after-hours callers heard a message asking them to call back during business hours[2].
The part that stayed with me was the callbacks. 22.0% of callers were told they would get a callback, and 45.5% of those did not get one within the promised timeframe or within 7 days[2].
88.4%
of business-hours calls ended in an appointment[2]
10.7%
of after-hours calls ended in an appointment[2]
45.5%
of promised callbacks did not arrive on time or within 7 days[2]
A promised callback that never comes is worse than no promise at all. The caller waited, trusted you, and then had to start again somewhere else. In most businesses nobody tracks this, so nobody knows it is happening.
Your phone line is a promise you make to strangers. The only way to know if you keep it is to be the stranger.
How to run your own mystery call
You do not need a research team. You need a friend, a list, and about 15 minutes a week. Ask someone the team does not know to call, or use a number your staff will not recognise. Then check a few simple things.
First, did anyone answer, and how many rings did it take? Second, if it went to voicemail, did the message give a clear next step, and was the mailbox full? Third, was the caller asked the right questions, the ones that lead to a booking or a sale? Fourth, if a callback was promised, did it actually happen, and how long did it take?
Try different times. Call at opening time, at lunch, in the last hour before closing, and once after hours. Problems usually hide in the gaps between shifts, not in the middle of a calm morning.
Fix the boring things first
The fixes are rarely glamorous. Check that every listing, from Google to directories to old flyers, shows the right number. Clear the voicemail box and rewrite the greeting so it tells callers exactly what happens next. Give callbacks an owner and a deadline, and write them down somewhere the whole team can see.
If you find the line is simply too busy at peak times or empty after hours, that is when extra cover makes sense. At PolymetricsLab we build AI voice agents that answer those calls, take the booking or the details, and hand over to staff when a person is needed. But the audit comes first. You cannot fix what you have never heard.
Your first step this week
Pick two times this week, one busy and one after hours. Ask a friend to call your main number at each, with a simple request like booking an appointment or asking for a quote. Have them note how long it took to reach someone, what they heard, and whether any promised callback arrived. Share the notes with your team on Friday. I promise it will be the most useful 15 minutes of your week.