I lost my replacement card. Can others see the SMS WeChat on the old card?

If the short message is stored in a mobile phone card (sim card), the person who gets the mobile phone card can see the content of the short message by plugging it into another mobile phone.

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.