Does anyone know what to expect from a phone interview with Deloitte?

Hi guys,

A few days ago, I received a phone call from a recruiter at Deloitte regarding an entry level analyst position that I applied to online. It was very casual and straight-forward, and at the end, the recruiter set up a phone interview for another time.

I'm a bit confused: I guess the phone interview will be more formal and will be more technical than the casual phone call that I received on the fly, but I've never went through two phone calls with the same person during an interview process before. Is this a known procedure? And should I be expecting more than the standard behavioural/technical questions, like cases, over the phone?