Students are prohibited from giving their MIT ID card to anyone else. This includes both physical ID cards as well as access to a Mobile ID or Mobile ID data in any form.
MIT ID cards are required to gain access to all MIT residence halls. MIT ID cards are also used to access house dining halls, can be used for Dining Dollars and TECHCash, and in some cases serve as a student's subway and bus pass.
Students who lose their MIT ID card, or have it stolen, should follow the procedures for card deactivation and obtaining a replacement, which can be found at https://idcard.mit.edu/.