25 minutes does strike me as a short interview. Either you did so well that they had no further reason to dig further into your experience and achievements, or you just aren't a 'good fit' for the role applied for and the firm.The telephone interview really is to determine whether or not they can put you in front of a client (the right attitude, approach, professionalism). This is especially crucial if you're NOT from a consulting background.Secondary to that, it's to determine you are what you say you are in your CV (skills, experience) to gauge what level you potentially are.E.g. if you're applying for a Manager role, but have never led a team or brought in business then it may be better to consider you for a lower level.I'd give them a call and follow up on feedback/outcome.