The interviewer experienced some technical problem and was late. A few minutes chat about the post (why would you apply, why do you wanna work for us etc), and then a case study of a telecom company before and after a campaign, incidence of profit and cost, and strategy of expansion.

Online problem solving exercise, followed by a 3 hour "powerday" with two cases and one product strategy interview. Cases are very numerical, more focus on calculations, and a few creativity based questions as well.