I no longer display my phone number (£1 a day) because I have other commitments/do other things which made fielding lots of new phone enquiries no longer viable. Regulars still get in touch with the number they have for me, they know the score, where I am, what's on offer so it's a quick phone call to arrange a time. Before I stopped displaying my number I would pop my phone on to check messages etc and phone calls would come through, would answer and it turn into a long enquiry. Now new clients I email with their questions, and some regulars do already book using that method. I can answer when convenient instead of them phoning and getting annoyed I'm not answering or I don't have time to speak to them properly.
Works well, and I know of other ladies who in a similar position who do the same.
Others I can't speak for.