They see an unknown number. That is the entire problem, and it is bigger than it sounds, because a large share of people no longer answer unknown numbers at all.

Everything else follows from that. Your name does not appear on their screen unless they have saved you. Your old text thread does not continue — a message from a new number starts a new thread, in a different place in their list, with none of the previous conversation above it. Their saved contact card still points at the old number, so every time they initiate, they initiate to the wrong line. And if they are in a bad moment, they will reach for the number they have always used, not the one in an email from three weeks ago.

A therapist who used to forward an after-hours line to a cell described exactly this from the other direction: a client in crisis got a callback from a different number and was confused by it. She eventually gave up on the two-number setup entirely and went back to one phone. That is the failure mode worth designing against — not clients objecting to the change, but clients quietly not recognising you.

Why they keep calling the old number

Because they never had to think about your number before, and now they do.

People do not store a therapist's number as information. They store it as a behaviour — the thread they scroll to, the entry under your first name, the recent-calls list. A new number breaks all three at once, and none of them are things a client will notice are broken until they try to use them.

The stragglers are also not random. In the experience practitioners describe, the people most likely to still be dialling the old number six weeks later are the ones who contact you least often — which correlates uncomfortably with the people whose calls matter most when they finally come.

What makes it worse

Only telling them once, verbally. A number mentioned at the end of a session does not survive the week.

Calling out from a different number than the one you gave them. If your outbound calls show a number that is not the number on your card, you have created a second unknown number rather than replacing the first. Check what your outgoing calls actually display, by calling someone and asking.

Not being named on their screen. A caller display "normally indicates the phone number and name associated with the line used to call you" (CRTC) — the name is a property of the line rather than something you type in at your end. Find out which you have instead of assuming: call someone who does not have you saved and ask what came up.

Leaving the old line silent. A dead number is worse than a redirected one. If someone reaches nothing, you never learn they tried.

What actually fixes it

Three things, in order of how much they help.

Ask them to save the contact, explicitly, as a task. Not "my new number is X". Something closer to: save this number under my name now, and delete the old one. People do it when asked directly and almost never do it otherwise. This is the single highest-leverage sentence in the whole switch.

Text them from the new number. Where you have consent to text, a message from the new line puts the number in their phone in the place they will actually look, and gives them something to reply to. A number that arrives inside an email is a number they have to retype.

Keep the old line answering for a good while. A greeting on the old number that states the new one, slowly and twice, catches the people who never read the message. This is the safety net for the low-contact clients who are the whole reason to bother.

Then do the boring version of the same thing: put the new number in your email signature, on your website, on your directory listing and on your invoices, so that the version of your number circulating in the world matches the one you want people to use.

What clients actually say about it

Very little, in practice. Practitioners who have moved a client base describe the reaction as unremarkable — people update a contact and carry on, and the dreaded awkward conversation mostly does not happen.

The friction is administrative, not relational. Nobody experiences a number change as a rupture. They experience it as an errand, and some of them do not do the errand.

The one case that is different

If your old number was ringing your personal phone, and the new one does not, be aware that you have changed two things at once: the number, and your availability.

That second change is usually the point. But it is worth being explicit about it in the same message, because otherwise the first client who calls the new line after hours and gets a greeting instead of you will read the greeting as a consequence of the switch rather than as a boundary you set on purpose.

Say what the new line does and when. It is a better message than "my number changed" anyway.

The short version

They see an unknown number, and a lot of people do not answer those. So do not just announce the number — ask them to save it as a contact, text them from it so it lands in their phone, and leave the old line speaking the new one for longer than feels necessary. The clients are fine. Their address books are the problem.

About Rivet

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