When using an on-campus phone please dial 5 before the extension number. In many countries the law requires every person to carry an identity card at all times. There is no such requirement in the United States. There is no national identity card. An identification document of some kind is often needed though, especially to cash checks or make purchases with checks.
Students have student identification cards that can be used for that purpose.
Most Americans use a driver's license as an ID card. If you will be driving a car while living in Rochester you should get a New York State driver's license . The procedures for obtaining a driver's license are explained in Chapter 2. If you will not be driving you can go to the Department of Motor Vehicles with your passport, RIT ID card and transcript and Social Security number and obtain a photo ID card.