Students can pick up the receiver and swipe their card to make a call.

2. By setting an expiration date for the IC card, students can make free phone calls within the validity period.

3. You can set a family number on the IC card, and students can only dial the family number after swiping the card at the pickup, or not set it, and students can freely dial the number after swiping the card at the pickup.

4. Both the phone and IC card support setting specified sectors, achieving the effect of using the specified IC card to make calls to the specified phone.

If phone 1 has 1 sector, phone 2 has 2 sectors, and the IC card has 1 sector, then the card can only be used on phone 1. If used on phone 2, it will be displayed as an invalid card and cannot be dialed.