Removable User Identity Module

Removable User Identity Module

Removable User Identity Module (R-UIM) is a card developed for CDMA handsets that extends the GSM SIM card to CDMA phones and networks. To work in CDMA networks, the R-UIM contains an early version of the CSIM application. The card also contains SIM (GSM) application, so it can work on both 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 [http://www.3gpp2.org/Public_html/specs/C.S0023-C_v1.0_060530.pdf] .

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.

The R-UIM card is has been superseded by CSIM on UICC. This technique allows all three applications (SIM, CSIM, and USIM USIM) to coexist on a single smartcard, allowing the card to be used in virtually any phone worldwide that supports smart cards.

The CSIM application, a port of R-UIM functionality to the UICC, is defined in standard [http://www.3gpp2.org/Public_html/specs/C.S0065-0%20v1.0_060630.pdf]

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.

ee also

*CDMA Subscriber Identify Module (CSIM)
*Subscriber Identity Module (SIM)
*Universal Subscriber Identity Module (USIM)
*W-SIM
*MEID

External links

* [http://www.cdmatech.com/products/ruim.jsp Qualcomm]
* [http://electronics.ihs.com/news/2005/tia-removable-user-identity-module.htm TIA Standardizes Removable User Identity Modules]
* [http://www.cdmatech.com/products/ruim.jsp R-UIM Overview]
* [http://www.wisegeek.com/what-is-a-ruim-card.htm What is a R-UIM Card?]
* [http://www.cdg.org/resources/white_papers/files/Smart_Cards_for_CDMA_Gemplus.pdf Why do CDMA Subscribers Need the R-UIM?] - PDF Whitepaper
* [http://www.china.org.cn/english/BAT/109251.htm Dual-mode R-UIM Tech in Focus]


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