I applied online. The process took 3 days. I interviewed at T-Mobile in May 2015
Interview
First was a screening from HR. The questions were just to gauge your interest for the intern and if you were still willing to take the offer. Typically it would sound like, "When are you available and what dates? Where do you go to school? What major?"
Interview questions [1]
Question 1
From your research what do you know about T-Mobile? Do you have any experience in computer networking and telecommunications? 4G/LTE stuff.... What are the current trends in the industry? Where do you see yourself in 5 years?