[paul]

Depends on the business type I would say.

If you are a photographer, and you are the business, then a mobile number would be expected, even demanded (given that the expectation is that a photographer would during the normal course of a day be away and taking photos - I would also imagine that most customers would also want to talk directly with the photographer even for bookings, as part of the briefing process).

If you are an IT business, but still the primary asset of the business, I think a landline is worth it to appear not only legitimate, but long term (and the issue of not personally manning the land line isn't relevant as it is a simple process to redirect a land line to a mobile).