Hi zednic20.
Mine was conducted over the phone. Make sure once you move out of your home country you provide INZ with your new address and phone number.
INZ will contact you over email first and will normally give you an interview date 4 weeks into the future. They will give you the option to change the date(you can bring it forward too).
Make sure you agree with INZ officer to a time which is suitable to both of you given the constraints of time zones between your home country and current location.