Removable User Identity Module
Removable User Identity Module (R-UIM) is a card developed for CDMA handsets that is equivalent to the GSM SIM and 3G USIM except that it is capable of working in both CDMA and GSM phones and networks. To work in CDMA networks, the R-UIM contains a CSIM application. The card also contains SIM (GSM) and USIM (UMTS) applications, so it can work on all three networks. It is physically compatible with GSM SIMs and can fit into existing GSM phones as it is an extension of the GSM 11.11 standard [1].
The card brings one of the main advantages of GSM to CDMA network phones. By having a removable identity card, CDMA users can change phones while keeping their phone numbers by simply swapping the cards. This simplifies many situations such as phone upgrades, phone replacements due to damage, or using the same phone on a different provider's CDMA network.
A CSIM is defined as a CDMA2000 application on UICC, an evolution to the R-UIM. It is defined in standard [2]
This form of card is widely used in China under the CDMA service of China Unicom. However, it is also used elsewhere such as India, Thailand, and Japan.
See also
- CDMA Subscriber Identity Module (CSIM)
- Subscriber Identity Module (SIM)
- Universal Subscriber Identity Module (USIM)
- W-SIM
- MEID
External links
- Qualcomm
- TIA Standardizes Removable User Identity Modules
- R-UIM Overview
- What is a R-UIM Card?
- Why do CDMA Subscribers Need the R-UIM? - PDF Whitepaper
- Dual-mode R-UIM Tech in Focus
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