The purpose of this application is to show the SIM info the Network info and the Device info altogether.
Another purpose is to check DUAL-IMSI behavior since the app can detect IMSI change automatically.
When the SIM is inserted the IMSI is saved to the phone's memory automatically and then if the first IMSI is switched with the second IMSI or the new SIM is inserted the app will display the pop-up screen to notify that the IMSI is changed.