In the registrar's offices that I'm familiar with, and I'm pretty sure they're pretty standard, we must have an address. We will not register a student who will not provide an address, and they provide the address where they're living, on-campus or off-campus. Our students are also ubiquitous in terms of cell phones, and the bill is coming in to them wherever they're living. I simply don't accept the argument.
I talk to students all the time—by the way, I teach full-time, I'm not a part-timer—and they're very open and transparent, and they are very sophisticated. As I said, I do not know a student who doesn't have a cell phone, which means they have a cell phone bill with an address.