Whilst contact and business numbers are usually readily available on a company’s website, being handed a phone number or an email address in the flesh and genuinely being invited to ask questions and get in contact is a great sign to be shown by an interviewer. Attempting to make sure that you are still interested and engaged, it’s a great way for interviewers to ensure that a candidate feels like they are looked after and wanted.
One of the best interview guides I’ve read.