The smart card does not replace your child’s physical library card, which allows for a total check-out of 25 books.  Since these are two different cards, there is no conflict.  Either card will allow your child access to physical materials and online resources, but the smart card will allow your child to use his or her Student ID# as a library card number.  The PIN for the physical card is normally the last four digits of the phone number, but the smart card will use the last four digits of the Student ID# as a PIN. ​