1. Prepare the mobile phone, open the back cover of the mobile phone and put on the campus card.

2. If you need to cut the card, please go to the mobile phone shop to cut the card.

With this card, the mobile phone card is activated.

4. The campus card will pre-store a few phone bills.

5. You can change the software package after activation.

Mobile phone and SIM card together constitute mobile communication terminal equipment. No matter in GSM system or CDMA system, users of digital mobile phones will get a SIM card when they "access the network". SIM card is also called smart card or subscriber identification card, and digital mobile phone can only be used after installation. SIM card is a kind of card with large-scale integrated circuit, which stores the information of digital mobile phone customers, encryption keys and other contents. The network can use it to identify customers and encrypt voice information when customers talk.