Advice > Consulting

Phone and video case interviews at McKinsey, BCG, and Bain

By Max Serrano on May 17, 2023 How we wrote this article
Phone and video case interviews at McKinsey, BCG and Bain

You will typically have to go through 5 to 10 interviews before being offered a job in consulting. It’s very likely that at some point in the process, one of your interviews won’t be face-to-face. Instead, it will be a phone or a video interview.

The usual case interview tips apply for phone and video interviews as well. But there are a number of points to keep in mind as you prepare for this specific format. Let’s go through the top 3 things that make phone case interviews different and how you should prepare for them.

Click here to practise 1-on-1 with MBB ex-interviewers

1. Expect phone interviews earlier in the process

This type of interviews tend to be used by McKinsey, BCG and Bain early in their recruiting process. If you have been invited to one of them it means that the firm likes your resume and cover letter. They want to talk to you for a first assessment before bringing you into their office for a series of more in-depth conversations. There are two main reasons consulting firms do that.

The first one is time. Consultants and partners travel a lot and are usually outside of the office from Monday to Thursday. It’s therefore just easier to organise a phone or video case interview than a face-to-face one. This means the firms can screen more people and run a faster hiring process.

The second one is cost. Flying you out to their office is obviously costly. But booking 3 or 4 interviews with Partners while you are in their office also costs the firm money. Before making that investment, they want to make sure that you meet minimum requirements and actually have a chance of getting hired. Doing well at your phone or video interview is therefore obviously mandatory if you want to end up getting an offer.

2. Avoid the “bad phone / video connection” trap

The most frustrating thing that can happen to you in a phone or case interview is to fail because of a “bad phone or video connection”. Don’t let that happen to you. There are things you can and should do to avoid falling into that trap.

First, you should make sure that you will be taking the phone or video call from a place that’s quiet and has good signal / WIFI. This is something you should definitely keep in mind when you pick a time for your interview.

Second, if your connection is fine, but your interviewer’s connection is not, you need to say something. We have worked with a candidate in the past who could barely hear the case situation at the beginning of his interview but did not say anything because he was worried it would come across the wrong way. He was not able to solve the case properly and did not progress to the next round of interviews.

If you can’t hear your interviewer properly, you’ve got to say it and try to find a solution. Suggest to try calling into the line again. And if things don’t improve, ask if it would be possible to try to find another time to speak. Don’t let a technical difficulty come into the way of your success.

3. Pay special attention to communication

Once you can hear your interviewer properly, things will start to feel a lot like a regular case interview. In most cases your interviewer will ask you a fit / behavioural question followed by a case question and the interview will last 30 to 45mins.

But one thing we’ve noticed over the years is that phone interviews tend to put your communication skills under more scrutiny. In a face-to-face interview, your interviewer will be able to clearly read your body language and also take a look at what you write on your piece of paper. It's much harder to do that over the phone or video and what you say and how you say it therefore becomes much more important.

Your goal should be to communicate in a really clear and structured way. Here are three communication tips that will help you achieve this:

  • Use numbered lists. Using numbered lists makes it easy for your interviewer to follow what you are doing. For instance, you could say: “I’m going to calculate the market size for smartphones in the US in three steps. First, I’ll calculate X. Second, I’ll calculate Y. And finally, I’ll calculate Z.”
  • Summarise what you said. Regularly summarising what you said also helps your interviewer make sure she is on the same page as you are. For instance, you could say: “Right so we have learned three things so far. First, we know that the US smartphone market is worth $10bn. Second, we know the company’s market share is down 3% year on year. And third, we know that costs rose by 5% last year.”
  • Talk slower and articulate more than usual. Finally, you shouldn’t hesitate to talk slower and to articulate more than you usually would when you are on the phone or on video. What you say is just harder to understand for the person listening to you because they can't see you as well as they normally would. You need to take that into account and make it easy for them.


If you apply for consulting jobs, chances are you will have at least one phone or video interview early in your recruiting process.

The usual case interview tips apply for this interview format as well. But in addition, you should make sure that you’ve got a good connection and are in the best conditions possible to solve the case. And you should also make an extra effort to communicate in a clear and structured way. This will make a big difference to your interviewer.

The best way to achieve this is to practise interviewing out loud, and you can do that in three main ways:

  1. Interview yourself (out loud)
  2. Practise interviewing with friends or family
  3. Practise interviewing with ex-interviewers

Practising by yourself is a great way to get started, and can help you get more comfortable with the flow of a case interview. However, this type of practice won’t prepare you for realistic interview conditions. 

After getting some practice on your own, you should find someone who can do a mock interview with you, like a friend or family member.

We’d also recommend that you practise 1-1 with ex-interviewers from top consulting firms. This is the best way to replicate the conditions of a real case interview, and to get feedback from someone who understands the process extremely well.

Click here to book your mock case interview.


Related articles:

Woman in suit working on a tablet
ConsultingNov 28, 2022
“Why Bain?” interview question (with sample answer)
The Why Bain? interview question is certain to come up in your consulting interviews. In this article we break down how you can give a strong answer to the "Why Bain?" question, with a sample answer.
Read more
Case interview maths
ConsultingAug 16, 2022
Case interview maths (formulas, practice problems, and tips)
Practice consulting interview maths with this list of tricks, example questions, drills, and a free cheat sheet. Prep for case maths at McKinsey, BCG, Bain, etc.
Read more
Oliver Wyman case interview
ConsultingApr 13, 2023
Oliver Wyman Case Interview: Ultimate Guide (2024)
The ultimate guide to Oliver Wyman case interviews. Learn about the consulting interview process, what questions to expect, how to answer them and how to prepare. Essential reading for anyone applying to a consulting position at OW.
Read more
Case interviews tips for McKinsey, BCG and Bain (MBB)
ConsultingMar 23, 2023
15 case interviews tips for McKinsey, BCG and Bain
15 case interview tips to get an offer at McKinsey, BCG and Bain. Start preparing early. Learn the case fundamentals. Practice with peers. Always use the same step-by-step approach. Listen carefully and ask clarification questions. Structure, structure, structure. Don't reuse case frameworks. Etc.
Read more
Consulting career path
ConsultingApr 30, 2019
Consulting career path: 6 steps to the top (McKinsey, BCG, Bain)
Consulting is not your typical 9-to-5 job. It offers unique opportunities, along with challenges you won't find in a normal corporate firm. Understanding the differences can be really difficult. Check out this post to get your consulting career path questions answered.
Read more
McKinsey Personal Experience Interview (PEI) questions
ConsultingJun 15, 2022
Ultimate guide to McKinsey PEI (questions, process and prep)
All the information you need to ace McKinsey Personal Experience Interview questions, including example questions, answer framework, tips and prep guide.
Read more
Big 4 vs MBB
ConsultingJul 20, 2022
Big 4 vs. MBB differences (and moving from Big 4 to MBB)
Detailed comparison of the Big 4 and MBB firms based on size, services, salaries, etc. Plus strategies for moving from a Big 4 firm to an MBB firm.
Read more
two women sit talking and taking notes
ConsultingMar 13, 2020
Written case interviews: the ultimate guide
This in-depth guide to written case interviews provides an overview of what to expect in this unique interview format, which is used by leading consulting firms like BCG and Bain. In addition, this guide will provide you with tips and a preparation plan to help you succeed.
Read more