What questions do they ask during the interview process at T-Mobile?

Mostly situational questions. You're asked to describe a recent situation, what steps you took to handle the situation and what was the final outcome. For example, describe a situation in which you had to ask a lot of questions to uncover a customer's needs. What was your approach?

Talk about being a family. They are too quick to freak out if a month is slow

How have you resolve customer complaints in the past.

Mock customer support

Basic information questions