UIMID
Encyclopedia
A UIMID is a 32-bit Electronic Serial Number
(ESN) stored in a R-UIM or CSIM ('smart card') used for TDMA
or CDMA2000
phones (mainly the latter). It is given a different name to avoid confusion with the hardware ESN stored in the phone. In all known systems the UIMID displaces the ESN in signaling (based on the 'UsgInd' field stored in the R-UIM). Because the UIMID is allocated from the same numbering space as ESN this is transparent to the network. The reason the UIMID is transmitted instead of the ESN is because the R-UIM contains the MIN
or IMSI
and devices such as the HLR running the ANSI-41 mobility management protocol insist on a static association between these identifiers. The HLR will store the MIN or IMSI alongside the ESN in each record, and if an ANSI-41 message is received containing a different pair it will be rejected.
UIMID codes are allocated by the TIA
using industry-defined guidelines and with codes that have been transferred from the ESN administrator (also the TIA).
ESN
and UIMID codes were exhausted by late 2008 at which point only reclaimed codes could be assigned to manufacturers including portions of blocks assigned to manufacturers but never used and portions used for technologies other than CDMA2000
. The TIA
stopped accepting applications for UIMID blocks on June 30, 2010. The replacement identifier is EUIMID
although for backwards compatibility a pseudo-UIMID (pUIMID) is still retained in cards. The pUIMID is composed of the prefix 0x80 to make it distinct from unique UIMID codes and a 24-bit SHA-1 hash of the EUIMID. pUIMID codes are not unique as there are only 224 of them and many times more EUIMID codes.
Electronic Serial Number
Electronic serial numbers were created by the U.S. Federal Communications Commission to uniquely identify mobile devices, from the days of AMPS in the United States from the early 1980s. The administrative role was taken over by the Telecommunications Industry Association in 1997 and is still...
(ESN) stored in a R-UIM or CSIM ('smart card') used for TDMA
Time division multiple access
Time division multiple access is a channel access method for shared medium networks. It allows several users to share the same frequency channel by dividing the signal into different time slots. The users transmit in rapid succession, one after the other, each using its own time slot. This...
or CDMA2000
CDMA2000
CDMA2000 is a family of 3G mobile technology standards, which use CDMA channel access, to send voice, data, and signaling data between mobile phones and cell sites. The set of standards includes: CDMA2000 1X, CDMA2000 EV-DO Rev. 0, CDMA2000 EV-DO Rev. A, and CDMA2000 EV-DO Rev. B...
phones (mainly the latter). It is given a different name to avoid confusion with the hardware ESN stored in the phone. In all known systems the UIMID displaces the ESN in signaling (based on the 'UsgInd' field stored in the R-UIM). Because the UIMID is allocated from the same numbering space as ESN this is transparent to the network. The reason the UIMID is transmitted instead of the ESN is because the R-UIM contains the MIN
Mobile Identification Number
Mobile identification number refers to the 10-digit unique number that a Wireless carrier uses to identify a mobile phone. A MIN is a number that uniquely identifies a mobile working under TIA standards for cellular and PCS technologies. Mobile identification number (or MIN) refers to the 10-digit...
or IMSI
International Mobile Subscriber Identity
An International Mobile Subscriber Identity or IMSI is a unique identification associated with all GSM and UMTS network mobile phone users. It is stored as a 64 bit field in the SIM inside the phone and is sent by the phone to the network...
and devices such as the HLR running the ANSI-41 mobility management protocol insist on a static association between these identifiers. The HLR will store the MIN or IMSI alongside the ESN in each record, and if an ANSI-41 message is received containing a different pair it will be rejected.
UIMID codes are allocated by the TIA
Telecommunications Industry Association
The Telecommunications Industry Association is accredited by the American National Standards Institute to develop voluntary, consensus-based industry standards for a wide variety of ICT products, and currently represents nearly 400 companies...
using industry-defined guidelines and with codes that have been transferred from the ESN administrator (also the TIA).
ESN
ESN
ESN may refer to:*Enterprise Social Network, a Web 2.0 paradigm of Social Networking with the specific focus of organisations collaborating more openly between all internal organisational areas, partner organisations, suppliers, and customers....
and UIMID codes were exhausted by late 2008 at which point only reclaimed codes could be assigned to manufacturers including portions of blocks assigned to manufacturers but never used and portions used for technologies other than CDMA2000
CDMA2000
CDMA2000 is a family of 3G mobile technology standards, which use CDMA channel access, to send voice, data, and signaling data between mobile phones and cell sites. The set of standards includes: CDMA2000 1X, CDMA2000 EV-DO Rev. 0, CDMA2000 EV-DO Rev. A, and CDMA2000 EV-DO Rev. B...
. The TIA
TIA
TIA may refer to:Aviation:* Tirana International Airport Nënë Tereza, , Tirana, Albania* Tampa International Airport, , commonly abbreviated as "TIA"...
stopped accepting applications for UIMID blocks on June 30, 2010. The replacement identifier is EUIMID
EUIMID
EUIMID is a unique identifier for an R-UIM or CSIM card in CDMA2000 cellular systems that replaces the older UIMID identifier....
although for backwards compatibility a pseudo-UIMID (pUIMID) is still retained in cards. The pUIMID is composed of the prefix 0x80 to make it distinct from unique UIMID codes and a 24-bit SHA-1 hash of the EUIMID. pUIMID codes are not unique as there are only 224 of them and many times more EUIMID codes.