How to set up a short message showing Xiaomi on the Sim card that does not exist on the mobile phone?

The default settings of SMS in most systems are stored in the internal memory of the mobile phone.

Both the SIM card and the memory of the mobile phone can store short messages (referring to the later smart phones and non-smart phones). The capacity of mobile phone SIM card is relatively small, and a card with general capacity can store about 40 short messages. SIM card is rarely used to store things, but at most, it stores the telephone information of some contacts.