The academic department to whom you have applied for a place will make the arrangements for your interview. This will include establishing the format in which it will be conducted, i.e. whether it will take place in person, on the telephone or by video conference.
After making an application, you should wait to hear from the academic department who will contact you to invite you for an interview and make the necessary arrangements. The department will provide you with information that will normally include: a summary of what the interview will cover; what it is for; and who will be involved.
If you need any special arrangements to be made for your interview, for example, if you have a disability, you should raise this when the department contacts you.