Welcome to your interview.
The question is on your right: Improving Customer Service Routing. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
If you were tasked with improving the efficiency of our customer service routing at T-Mobile US, what data points would you look at first?