SIM Cards

Subscriber Identity Module (SIM) Cards help to authenticate a user to a cellular network operator Cellular Networks

Types

• SIM (GSM)
• USIM (UTMS(WCDMA))
• R-UIM (CDMA)

"SIM Cards" are actually Universal Integrated Circuit Cards (UICC)

SIM consists of hardware and software:

• In GSM -> HW + SW (SIM app)
• In UTMS -> SW (Universal SIM (USIM) app)
• In CDMA -> HW (Removable User Identity Module (R-UIM)) + SW (CDMA SIM (CSIM))

Form Factors (FF)

• Standard SIM - 1FF (Card Size)
• Mini SIM - 2FF
• Micro SIM - 3FF
• Nano SIM - 4FF
• M2M Form Factor (MFF)
• M2M Form Factor 2 (MFF2)
• Integrated SIM (iSIM) - In SoC
• nuSIM
• Soft SIM

Digital

• eSIM/eUICC

Notes

• MSISDN (GSM) / MDN (CDMA) - Public Mobile Telephone Number
• MSRN (GSM) / TLDN (CDMA) - Mobile Routing Numbers
• IMSI, TMSI, ICCID