After the old mobile phone card is taken out, the short message can't be seen. Is it in the system?

Hello, what you want to ask is that after the old mobile phone card is taken out, you can't see the SMS in the system. Anything else? After the old mobile phone card is taken out, there is no short message in the system. The SMS system of the old mobile phone is stored in two places, one in the mobile phone card and the other in the system of the old mobile phone. In the mobile phone card of the old mobile phone, the SMS can't be seen after the old mobile phone card is taken out, which proves that the SMS exists in the mobile phone card, not in the system of the old mobile phone, so the SMS can't be seen in the system after the old mobile phone card is taken out. The mobile phone card is a chip that enables your mobile phone to access the communication network and use functions such as answering and making calls. System means that the mobile phone system is an operating system running on the mobile phone, a program to manage and control the hardware and software resources of the mobile phone, and the most basic system software running directly on the "bare metal". After the old mobile phone card is taken out, there is no short message in the system.