All-in-one card can be used to brush access control, canteen, water, supermarket, and so on. .

Sim card is just a mobile phone card, which is no different from ordinary cards.

The sim card of Datong University has the function of a card.

In other words, sim cards can be used to swipe cards, if they are students of the same university.

When you install a sim card on your mobile phone, you will receive a message from the mobile company showing the model of your mobile phone. Reply to any message to open the credit card function.

If the sim card is lost, it can be reissued in the mobile hall inside the same university, and the one-card function can be opened. The source of charge for one-card is the fee you pay when you move.

The charge for swiping the card comes from the balance in your sim card.

But the card has nothing to do with sim. The only problem is money.

Understand?