What does China mobile phone sim card toolkit mean?

STK is the abbreviation of "SIMcardToolKit", which means "SIM Card Development Toolkit". In order to use the additional value-added services of mobile phones, such as mobile banking, mobile stock trading, short message on demand, etc. , it is required to replace the ordinary mobile phone SIM card with STKSIM card.

Hello, SIM card toolkit is not a necessary service for SIM. Whether there is a SIM card toolkit or not, the mobile phone can work normally after activating the SIM card.

STK can encrypt the user's data at the bottom of the user's mobile phone. Encrypted data can only be decrypted at the right end of encryption, and the user's key data is safe during transmission. STK card mobile phones can provide additional menus, including information on demand, mobile banking and so on.

The password of the mobile phone card toolkit is the password set by Telecom, China Mobile or China Unicom when making SIM cards, in order to protect the security of mobile phone cards.