EUIMID

An expanded UIMID (EUIMID) is a unique identifier for an R-UIM (Removable User Identity Module) in CDMA2000 cellular systems that replaces the older UIMID.There are two forms of EUIMID, known as Short Form (SF_EUIMID) and Long Form (LF_EUIMID). Both forms produce a 32-bit pseudo-UIMID (pUIMID) with 0x80 in the upper 8 bits and the least significant 24 bits of the SHA-1 hash of the entire EUIMID in the lower 24 bits.

The EUIMID (and UIMID) are hardware identifiers that do not change throughout the life of the device they identify. Their most important characteristic is that they are globally unique, no two R-UIM devices should ever be given the same number. Secondly, they can identify the issuer of the code (most likely a mobile phone operator in the case of EUIMID, and a mobile phone manufacturer in the case of UIMID). The pseudo-UIMID is not unique, but can satisfy most uses of UIMID. Where this is not possible, or not desirable, another unique identifier should be used instead or the requirement for uniqueness should be removed.

Short Form EUIMID (SF_EUIMID)

The Short Form EUIMID is based on the 56-bit MEID and is allocated from the same numbering space by the current Global Hexadecimal Administrator (GHA), the TIA. This form requires new files within the R-UIM defined in 3GPP2 specification [http://www.3gpp2.org/Public_html/specs/C.S0023-C_v1.0_060530.pdf C.S0023-C v1.0 (or higher)] . [http://www.3gpp2.org/Public_html/specs/C.S0023-C_v1.0_060530.pdf C.S0023-C v1.0. Removable User Identity Module for Spread Spectrum Systems. 3GPP2. 2006.] ] This is published by the TIA as TIA-820-C.

The SF_EUIMID has the unique ability to override the phone’s own MEID in signaling. This is controlled by a flag inside the R-UIM stored in bit 2 of the UsgInd (Usage Indicator) elementary file (EF). This may make it easier to provision a R-UIM that is manufactured without other unique identifiers (such as MIN or IMSI). The tradeoff is that the phone hardware cannot be easily identified.

Long Form EUIMID (LF_EUIMID)

The Long Form EUIMID is the ICCID that has been present in many generations of smart cards, including the SIM cards for GSM. This is composed of up to 18 BCD digits -- up to 72 bits. The storage allocated for the ICCID is, however, 80 bits, so it is recommended that the Luhn check digit be included plus a padding digit (0xf). Importantly, it is recommended that the pseudo-UIMID is generated from the 80 stored bits in pending Version 2.0 of C.S0023-C. [ [http://www.3gpp2.org/Public_html/Misc/C.P0023-C_v1.95_R-UIM-Extended_VV_Due_28_August-2008.pdf C.S0023-C v2.0. Removable User Identity Module for Spread Spectrum Systems. 3GPP2. Publication pending. ] ] Until the publication of C.S0066-0 v2.0 there were no CDMA2000 protocols that provided visibility of the ICCID outside the R-UIM. [http://www.3gpp2.org/Public_html/SC/C.S0066-0_v2.0_080729.pdf C.S0066-0 v2.0. Over-the-Air Service Provisioning for MEID-Equipped Mobile Stations in Spread Spectrum Systems. 3GPP2. In Press.] ] The identifier that is usually transmitted as the 'ESN' over the radio interface is the 32-bit pseudo-UIMID.

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