EUIMID (expanded UIMID) is a

unique identifier A unique identifier (UID) is an identifier that is guaranteed to be unique among all identifiers used for those objects and for a specific purpose. The concept was formalized early in the development of computer science and information systems. ...

for an

R-UIM Removable User Identity Module (R-UIM, usually pronounced as "R-yuim") is a card developed for cdmaOne/CDMA2000 ("CDMA") handsets that extends the GSM SIM card to CDMA phones and networks. To work in CDMA networks, the R-UIM contains an early ve ...

(Removable User Identity Module) or CSIM (CDMA SIM application) card in

CDMA2000 CDMA2000 (also known as C2K or IMT Multi‑Carrier (IMT‑MC)) is a family of 3G mobile technology standards for sending voice, data, and signaling data between mobile phones and cell sites. It is developed by 3GPP2 as a backwards-compatib ...

cellular systems that replaces the older UIMID identifier. There are two forms of EUIMID, known as Short Form (SF_EUIMID) and Long Form (LF_EUIMID). Both produce a 32-bit pseudo- UIMID (pUIMID) with 0x80 in the upper 8 bits and the least significant 24 bits of the

SHA-1 In cryptography, SHA-1 (Secure Hash Algorithm 1) is a hash function which takes an input and produces a 160-bit (20-byte) hash value known as a message digest – typically rendered as 40 hexadecimal digits. It was designed by the United States ...

hash of the entire SF_EUIMID or the entire

ICCID A typical SIM card (mini-SIM with micro-SIM cutout)A SIM card or SIM (subscriber identity module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are us ...

EF (for LF_EUIMID) in the lower 24 bits. The EUIMID (and UIMID) are hardware identifiers that do not change throughout the life of the card they identify. Their most important characteristic is that they are globally unique, no two

or CSIM cards should ever be given the same number. Secondly, they can identify the issuer of the code (likely a mobile phone operator in the case of LF_EUIMID, and an

or CSIM card manufacturer in the case of SF_EUIMID). The pseudo-UIMID is not unique, but can satisfy most uses of UIMID. Where this is not possible, or not desirable, another unique identifier (such as EUIMID) 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 A mobile equipment identifier (MEID) is a globally unique number identifying a physical piece of CDMA2000 mobile station equipment. The number format is defined by th3GPP2 report S.R0048but in practical terms, it can be seen as an International M ...

and is allocated from the same numbering space by the current Global Hexadecimal Administrator (GHA), the TIA. This form requires new files within the

defined in

3GPP2 The 3rd Generation Partnership Project 2 (3GPP2) was a collaboration between telecommunications associations to make a globally applicable third generation (3G) mobile phone system specification within the scope of the ITU's IMT-2000 project. ...

specificatio
C.S0023-C v1.0 (or higher)
This was published by the TIA as TIA-820-C. The SF_EUIMID has the unique ability to override the phone’s own

in signaling. This is controlled by a flag inside the

stored in bit 2 of the UsgInd (Usage Indicator) elementary file (EF). This may make it easier to provision a

that is manufactured without other unique identifiers (such as MIN or IMSI). The tradeoff is that the phone hardware cannot be easily identified. This tradeoff was removed in 2008 by the ability to specify

or EUIMID in

OTASP An over-the-air update (or OTA update), also known as over-the-air programming (or OTA programming), is an update to an embedded system that is delivered through a wireless network, such as Wi-Fi or a cellular network. These embedded systems incl ...

signaling and in 2009 by the addition of these options to the CDMA air interface StatusRequest message. The term MEID_ME is used to distinguish the hardware identity of the phone from the MEID protocol element that may be the EUIMID.

Long Form EUIMID (LF_EUIMID)

The Long Form EUIMID is the

that has been present in many generations of smart cards, including the SIM cards for

GSM The Global System for Mobile Communications (GSM) is a family of standards to describe the protocols for second-generation (2G) digital cellular networks, as used by mobile devices such as mobile phones and Mobile broadband modem, mobile broadba ...

. This is composed of up to 18

BCD BCD may refer to: Computing * Binary-coded decimal, a representation of decimal digits in binary ** BCD (character encoding), a 6-bit superset of binary-coded decimal derived from the binary encoding of the same name * Boot Configuration Data, th ...

digits -- up to 72 bits. The storage allocated for the ICCID is, however, 80 bits, so it is recommended that the

Luhn The Luhn algorithm or Luhn formula (creator: IBM scientist Hans Peter Luhn), also known as the " modulus 10" or "mod 10" algorithm, is a simple check digit formula used to validate a variety of identification numbers. The algorithm is in the pub ...

check digit be included plus a padding digit (0xf). Importantly, it is recommended in Version 2.0 of C.S0023-C that the pseudo-UIMID is generated from all 80 stored bits. The LF_EUIMID first became externally accessible in 2008 with

specification C.S0066-0 v2.0.C.S0066-0 v2.0. Over-the-Air Service Provisioning for MEID-Equipped Mobile Stations in Spread Spectrum Systems. 3GPP2. 2008.
/ref> In 2009, the CDMA air interface was also upgraded to the so-called 'Release E' which allows the transmission of all available identifiers in the StatusRequest message. If an

or CSIM with Expanded UIMID is inserted in a phone the identifier that is usually transmitted as the ESN protocol element over the radio interface is the 32-bit pseudo-UIMID.

References

Mobile technology Wireless Identification {{DEFAULTSORT:Euimid