What is SIM

SIM known as Subscriber Identity Module

SIM features and contents are personalized by the Service Activator. SIM card has RAM and ROM both memory. RAM size is from 6 kb to16 kb whereas RAM size is 128 bytes to 256 bytes. EEPROM size is 3 kb to 8 kb

Contents of SIM:

  • Serial Number
  • IMSI, Subscriber Key Ki, Ciphering Key Kc
  • Algorithms for authentication and ciphering
  • Network Code
  • PIN, PUK
  • Charging Information
  • Abbreviated Dialling
  • Supplementary Features (e.g. Call barring)


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