Mumbai University > Electronics and Telecommunication Engineering > Mobile Communication

• SIM stands for Subscriber Identity Module.
• SIM contains users subscription information and contacts of phonebook.
• SIM is protected by PIN or password.
• SIM is a smart card which has unique IMSI (International Mobile Subscriber Identity) number.
• It allows user to retain the information even after he changes his mobile.
• It contains 3 modules that is CSIM, USIM and ISIM where CSIM stands for CDMA(Code Divsion Multiple Access)
• Subscriber Identity Module, USIM stands for Universal Subscriber Identity Module, and ISIM stands for IP Multimedia Services Identity Module.