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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