I know of some folks that had phone interviews for various reasons...either they didn't get ERAS in within the deadline, or were unable to fly cross-country due to an extenuating circumstance.
It seems as though the questions are fairly similar, and are often done in a phone-conference format. Things like "why psychiatry," "do you have any family or connections to this area" are standard fare both in face-to-face and phone interviews.
Good luck.