The type of interview you can expect is situational. That means, you will be asked questions that start with "Tell me about a time . . . " To successfully navigate these questions, you will need to have several "stories" about situations you encountered at past jobs. When answering the questions, think S.T.A.R Situation or Task (what happened), Actions (what you did) and Results (what was the outcome). The things you will be asked about are times when a customer was angry and took it out on you (normally this is verbally), how you receive feedback, how you responded when you got feedback you disagreed with, and how you decide what you will present by way of sales, to a customer. (This is key because T-Mobile has moved to a sales to service culture). Good luck!