The Stk apk is a application to handle SIM Tool Kit application in the SIM. This apk is pre-built by MediaTek internal. WHAT IT DOES? ============= The Stk apk is a application to handle proactive commands from SIM for display information included in the commands and interact with user and response the user's input to SIM. HOW IT WAS BUILT? ================== It will pre-built automatically by build process. HOW TO USE IT? ============== It always appears in launcher (app grid) for open market project. The application name is 'SIM Toolkit'. You can see a menu list for the SIMs if you inserted two SIMs or more and select one of SIMs and you can see a Stk menu for the SIM. If you insert only one SIM, you will see a STK menu for ths SIM when you enter Stk apk.