Where are the messages stored?

SMS messages are stored on the sim card.

SIM card is responsible for providing users with a lot of commercial information, which can be used to store short messages received by mobile devices from the network, especially short messages received when users are away or leaving, and short messages initiated by mobile stations. The required capacity is 176 bytes.

A more specialized application is to store priority lists, subaddress identifiers, network/bearer identifiers, etc. Its required capacity is 14+X bytes. When multiple networks can be accessed, users can make choices. When the real-time charge notice appears on the Internet, the SIM card can remember this information, so that users can know their own charges at any time.

Extended data:

Legal SIM cards must go through strict management steps before they can be used. When the SIM card leaves the factory, the specific data and key of the card have been written into it for personalization. Users can read or modify some information stored in the SM card. Reading or modifying personal information can be done through the keyboard of a mobile phone, or by connecting a SIM card to a personal computer and using related software.

SIM card is the key of GSM mobile communication terminal. Once the SIM card is pulled out from the mobile terminal, the terminal cannot use it except for emergency calls. SIM card can be used as a key, which also provides a lot of convenience for users. Users only need to insert or embed the SIM card into any GSM terminal to realize communication.