Nope, you don't need any copies of anything unless they specifically ask, but from what I remember from interviews, I didn't need to bring anything. You can bring a pen actually. I recall needing one during my first interview and not having it. Often, you'll be provided with a pen, but bring one in case. I brought a folder with paper to write in just in case, but they usually give you a folder of some type and you can take notes on whatever is in there. Bring your phone but turn it off or put it on silent. You'll have free time or off times to use it, and no, they won't care if you use it then (like if you're waiting around for an interview or during lunch or whatever).