EFR STK service

The EFR STK service is a service EFR: EFR enhanced full rate, which is fixed on the Cary by the mobile phone SIM, and a GSM network voice coding method. It is used for GSM mobile phones to encode and send voice based on the full rate 13Kbps. Good and clear voice quality (close to Qos4.7) requires network service providers to enable this network feature phone to work together. If your GSM network supports this feature, this feature will automatically open. Make your voice clearer and hear more!

STK: STK (SIM TOOL KIT), referred to as "user identification application development tool", can be understood as a set of commands for the development of value-added services, a small programming language that allows smart card based user identification module SIM to run its own application software .
The STK card is not an ordinary SIM card but a Simera32K card based on the Java language platform. STK is a small programming language software that can be hardened on a SIM card. It can receive and send GSM short message data, and it acts as an interface between the SIM card and the short message. It also allows the SIM card to run its own application software. These functions are often used on software-activated phone screens to replace mechanical "dial-listen-answer" methods with a friendly text menu, allowing users to easily perform complex information retrieval operations or transactions via the touch of a button. SIM card technology, \"Over-the-air download\" business, realize SIM card-based service business, such as mobile "Monternet" SIM card, "Movement Zone", etc. are based on STK technology SIM card, this technology can make SIM card Has a large storage capacity and built-in operators to provide various services.

STK can be understood as a group of commands for the development of value-added services, a small programming language that allows smart card-based user identification modules (SIM cards) to run their own application software.

STK technology is mainly used in mobile banking, stock trading, foreign exchange trading, financial management, and other areas. The new mobile services such as "mobile banking" and "stock inquiry and trading" are using this technology.
The STK card, like the original SIM card, can be used on ordinary GSM mobile phones. The difference is that the STK card is a new generation of smart cards with high storage capacity. After the user puts STK card on the GSM network, he only needs to pay a fixed monthly fee (different from province to province).