Details：
The phone has a built-in mobile phone card (China Unicom/Mobile supports 2G, 3G, 4G, and Telecom supports 4G and requires volte activation). Write the validity period and family number on the card issuing software to enable free family calls within the validity period of the card.

Details：
Supporting the insertion of SIM cards into public telephones for China Mobile Unicom; Support the insertion of telecommunications UIM cards into campus telephones with large cards; Support RFID-SIM two in one use; Kato can be used with 13.56M or 125K, M1 card and ID card, and campus one card system; Support custom stickers

Details：
The user holds a card (13.56M RF card, ID card, CPU card) or makes phone calls through the campus IC card.