In most circumstances, no - your BuckID card number is restricted Institutional Data and as such must be protected by all members of the university community. The short number (also known as an EMPL, employee ID number or student ID number) on the BuckID is classified at the S2 level (Internal Institutional Data) while the long number (also known as the card number or ISO number) is classified at the S4 level (Restricted Institutional Data). The BuckID card number was recently elevated from the S3 level (Private Institutional Data) to the S4 level to acknowledge its role as a debit card number and the potential risks of identity theft and financial loss. To learn more about institutional data and your role in protecting it please visit the Office of Technology and Digital Innovation Institutional Data Policy page which contains detailed definitions of the Four S-levels as well as a calculator for determining what S-Level a combination of data elements creates.
If you need to complete a purchase with your BuckID over the phone, you should exercise caution and ensure you trust the business that you are providing the information to, just as you would when completing a transaction with your credit or debit card over the phone.