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Definition: CSIM


(CDMA2000 Subscriber Identify Module) An application for CDMA cellphones that provides the same features as the SIM card for GSM cellphones. The CSIM program runs in a smart card inserted into the phone, and the card can be a Removable User Identity Module (R-UIM) for CDMA networks only or a Universal Integrated Circuit Card (UICC), which can be programmed to run on GSM and UMTS networks. See R-UIM, UICC, USIM and SIM card.