How does Android phone store SMS in sim card?

That depends on the specific model of the mobile phone. If the mobile phone supports it, open/SMS-Settings, advanced settings, and check "Set SMS to SIM card".

If the mobile phone doesn't support it, go to the Android market to search for the next sim card management software, and transfer the SMS to the SIM card according to the operation instructions.

SIM card is the abbreviation of (subscriber identity module).

GSM digital mobile phones are also called subscriber identification cards and smart cards, and they must be installed before they can be used. Digital mobile phone customer information, encryption key and user phone book are stored on the computer chip, which can be used to authenticate the identity of GSM network customers and encrypt the voice information when customers talk.