What does STK mean?

EFR:EFR enhanced full rate, a GSM network voice coding method, is used for voice coding and transmission of GSM mobile phones based on 13Kbps full rate, which can obtain better and clearer voice quality (close to Qos4.7), and requires network service providers to open the mobile phones with this network function. If your GSM network supports this function, this function will be turned on automatically. Let the voice be clearer and hear more clearly!

STK: STK:STK(SIM TOOL KIT), abbreviated as "User Identification Application Development Tool", can be understood as a set of commands for developing value-added services, a small programming language that allows SIM, a user identification module based on smart cards, to run its own application software.

STK card is not an ordinary SIM card, but a Simera32K card based on Java language platform. STK is a small programming language software that can be solidified in the SIM card. It can receive and send GSM short message data as an interface between SIM card and short message, and it also allows SIM card to run its own application software. These functions are usually used to replace the mechanical "dial-answer-answer" mode with a friendly text menu on the telephone display screen, which can be activated by software, thus allowing users to easily carry out complex information retrieval operations or transactions by pressing keys. SIM card technology, over-the-air download service, and services based on SIM cards, such as Monternet SIM card and M-Zone, are all SIM cards based on STK technology, which can make SIM cards have large storage capacity and built-in services provided by operators.

STK can be understood as a set of commands for developing value-added services, a small programming language that allows SIM cards based on smart cards to run their own application software.

STK technology is mainly used in mobile banking, stock trading, foreign exchange trading, financial secretary and other fields. This technology is used in new mobile services such as "mobile banking" and "stock inquiry and trading".

STK card, like the original SIM card, can be used on ordinary GSM mobile phones. The difference is that STK card is a new generation of smart card with high storage capacity. Users only need to pay a fixed fee every month after replacing STK cards at GSM outlets (different provinces).

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By glass! Personal opinion!