What's the difference between a SIM card and a space card? I need very detailed information about them.

SIM card (subscriber identity module), that is, subscriber identity card, is a personal data card of GSM digital mobile phone. It is made by A-level encryption method, which stores the user's data, authentication method and key, and can be used to authenticate the user's identity in GSM system. At the same time, users can connect with the system and exchange information through it.

The mobile phone can only be used with the SIM card. "SIM cards" have different sizes and the same functions, and are suitable for different types of GSM mobile phones. SIM card can be inserted into any mobile phone that meets the GSM standard, and the phone bill is automatically included in the cardholder's bill, no matter what mobile phone it is.

The use of SIM card effectively prevents embezzlement, parallel connection and telephone eavesdropping, and ensures the normal communication of users.

In order to ensure that your mobile phone will not be stolen after it is lost, each SIM card can be set with a set of personal passwords (PIN codes) to lock the SIM card, and the passwords are set by the users themselves. Only by entering the password correctly will the mobile phone enter the normal use state. If the wrong personal password is entered three times in a row, the phone will lock the SIM card. In this case, please turn off the phone immediately and take the phone and SIM card to the wireless office to unlock it. If you continue to operate at this time, the SIM card will be destroyed automatically, causing unnecessary losses to you.

Mobile phone space card is an anonymous mobile phone SIM card.

Space cards in Hong Kong dramas are only opened when they are used. Cards that are not used at ordinary times, or cards that are thrown away after being punched once, are generally more expensive than those registered.