31:
771:
215:
Law enforcement and intelligence services can use an IMEI number as input for tracking devices that are able to locate a cell phone with an accuracy of a few meters. Saudi
Arabian government agencies have reportedly used IMEI numbers retrieved from cell phone packaging to locate and detain women who
172:
In New
Zealand, the NZ Telecommunications Forum Inc provides a blocked IMEI lookup service for New Zealand consumers. The service allows up to three lookups per day and checks against a database that is updated daily by the three major mobile network operators. A blocked IMEI cannot be connected to
179:
In some countries, such blocklisting is not customary. In 2012, major network companies in the United States, under government pressure, committed to introducing a blocklisting service, but it's not clear whether it will interoperate with the CEIR. GSM carriers AT&T and T-Mobile began blocking
496:
The presentation of the Check Digit both electronically and in printed form on the label and packaging is very important. Logistics (using bar-code reader) and EIR/CEIR administration cannot use the Check Digit unless it is printed outside of the packaging, and on the ME IMEI/Type
Accreditation
235:
Some countries use allowlists instead of blocklists for IMEI numbers, so that any mobile phone needs to be legally registered in the country in order to be able to access mobile networks of the country, with possible exceptions for international roaming and a grace period for registering. These
128:
The existence of a formally allocated IMEI number range for a GSM terminal does not mean that the terminal is approved or complies with regulatory requirements. The linkage between regulatory approval and IMEI allocation was removed in April 2000, with the introduction of the
European R&TTE
153:
To make blocklisting effective, the IMEI number is supposed to be difficult to change. However, a phone's IMEI may be easy to change with special tools. In addition, IMEI is an un-authenticated mobile identifier (as opposed to IMSI, which is routinely authenticated by home and serving mobile
680:
networks all use IMEI numbers on their transceiver units as well as SIM cards in much the same way as GSM phones do. The
Iridium 9601 modem relies solely on its IMEI number for identification and uses no SIM card; however, Iridium is a proprietary network and the device is incompatible with
145:
When someone has their mobile equipment stolen or lost, they can ask their service provider to block the phone from their network, and the operator may do so, especially if required by law. If the local operator maintains an
Equipment Identity Register (EIR), it adds the device IMEI to it.
161:
In the UK, a voluntary charter operated by the mobile networks ensures that any operator's blocklisting of a handset is communicated to the CEIR and subsequently to all other networks. This ensures that the handset is quickly unusable for calls, at most within 48 hours.
500:
The check digit is not transmitted over the radio interface, nor is it stored in the EIR database at any point. Therefore, all references to the last three or six digits of an IMEI refer to the actual IMEI number, to which the check digit does not belong.
278:
The IMEI (15 decimal digits: 14 digits plus a check digit) or IMEISV (16 decimal digits: 14 digits plus two software version digits) includes information on the origin, model, and serial number of the device. The structure of the IMEI/SV is specified in
269:
access, but do not require IMEI registration by customers. Instead, phone manufacturers are required to register their devices into AT&T's or Telus' databases, and customers are able to freely swap SIM cards into any allowlisted device.
236:
include Chile, Turkey, Azerbaijan, Colombia, and Nepal. Other countries that have adopted some form of mandatory IMEI registration include India, Pakistan, Indonesia, Cambodia, Thailand, Iran, Nigeria, Ecuador, Ukraine and
Lebanon.
157:
Australia was the first nation to implement IMEI blocking across all GSM networks, in 2003. In
Australia the Electronic Information Exchange (EIE) Administration Node provides a blocked IMEI lookup service for Australian customers.
117:, under the Mobile Telephones (Re-programming) Act, changing the IMEI of a phone, or possessing equipment that can change it, is considered an offence under some circumstances. A bill was introduced in the United States by Senator
1258:
102:(IMSI) number, which is stored on a SIM card that can, in theory, be transferred to any handset. However, the network's ability to know a subscriber's current, individual device enables many network and security features.
150:(CEIR), which blocklists the device with other operators that use the CEIR. This blocklisting makes the device unusable on any operator that uses the CEIR, which makes mobile equipment theft pointless, except for parts.
291:
at the end. For the IMEI format prior to 2003, the GSMA guideline was to have this Check Digit always transmitted to the network as zero. This guideline seems to have disappeared for the format valid from 2003 onwards.
86:
is stolen, the owner can have their network provider use the IMEI number to blocklist the phone. This renders the phone useless on that network and sometimes other networks, even if the thief changes the phone's
124:
IMEI blocking is not the only way to fight phone theft. Instead, mobile operators are encouraged to take measures such as immediate suspension of service and replacement of SIM cards in case of loss or theft.
98:
capability usually do not have an IMEI code. However, the IMEI only identifies the device and has no particular relationship to the subscriber. The phone identifies the subscriber by transmitting the
790:
405:, which identifies the GSMA-approved group that allocated the TAC. The RBI numbers are allocated by the Global Decimal Administrator. IMEI numbers being decimal helps distinguish them from an
490:(ISO/IEC 7812). (See GSM 02.16 / 3GPP 22.016). The Check Digit is a function of all other digits in the IMEI. The Software Version Number (SVN) of a mobile is not included in the calculation.
1283:
1254:
299:, although it may not always be displayed this way. The IMEISV does not have the Luhn check digit but instead has two digits for the Software Version Number (SVN), making the format
176:
In Latvia the SIA "Datorikas institūts DIVI" provides a blocked IMEI lookup service for checks against a database that is updated by all major mobile network operators in Latvia.
192:
where consumers can check whether a smartphone has been reported as lost or stolen to its member carriers. The relationship between the former and any national or international
1233:
479:
1077:
207:
IMEIs can sometimes be removed from a blocklist, depending on local arrangements. This would typically include quoting a password chosen at the time of blocklisting.
422:
130:
1475:
836:
1507:
1163:
786:
1359:
398:
for all phones was 00. After April 1, 2004, the Final
Assembly Code ceased to exist and the Type Allocation Code increased to eight digits in length.
251:
law mandating it. If a user changed their device, they had to register their new IMEI and SIM card. This isn't the case with other CDMA carriers like
1031:
941:
690:
99:
1279:
394:(FAC), which was a manufacturer-specific code indicating the location of the device's construction. From January 1, 2003 until April 1, 2004, the
70:
1210:
1130:
247:
in the United States used an allowlist of devices where a user had to register their IMEI and SIM card before a device can be used, despite no
519:
Conversely, one can calculate the IMEI by choosing the check digit that would give a sum divisible by 10. For the example IMEI 49015420323751
69:. It is usually found printed inside the battery compartment of the phone but can also be displayed on-screen on most phones by entering the
255:
which only used allowlists for 3G and T-Mobile does not use an allowlist but instead a blocklist, including for former Sprint customers.
1333:
193:
147:
963:
1497:
199:
It is unclear whether local barring of IMEI has any positive effect, as it may result in international smuggling of stolen phones.
1385:
1229:
82:
networks use the IMEI number to identify valid devices, and can stop a stolen phone from accessing the network. For example, if a
493:
The purpose of the Check Digit is to help guard against the possibility of incorrect entries to the CEIR and EIR equipment.
1255:"Homologación y recepción de alertas de emergencia serán obligatorias en teléfonos celulares a contar del 23 de septiembre"
844:
666:
1472:
1502:
113:
Many countries have acknowledged the use of the IMEI in reducing the effect of mobile phone thefts. For example, in the
1304:
1512:
695:
445:: 23 - The "software version number" identifying the revision of the software installed on the phone. 99 is reserved.
166:
1427:
1105:
189:
154:
networks.) Using a spoofed IMEI can thwart some efforts to track handsets, or target handsets for lawful intercept.
848:
412:
For example, the old style IMEI code 35-209900-176148-1 or IMEISV code 35-209900-176148-23 tells us the following:
180:
newly reported IMEIs in
November 2012. Thefts reported prior to November 2012 were not added to the database. The
88:
1153:
1186:"The Saudi government is hunting down women who flee the country by tracking the IMEI number on their cellphones"
402:
1355:
252:
17:
76:
on the dialpad, or alongside other system information in the settings menu on smartphone operating systems.
1185:
1122:
1035:
670:
395:
391:
869:
724:
30:
417:
284:
1158:
1126:
877:
181:
1089:
244:
224:
430:: 00 - indicating the phone was made during the transition period when FACs were being removed.
51:
137:) to legitimate GSM terminal manufacturers without the need to provide evidence of approval.
1451:
992:
121:
in 2012 that would have made the changing of an IMEI illegal, but the bill was not enacted.
677:
409:, which is hexadecimal and always has 0xA0 or larger as the first two hexadecimal digits.
134:
66:
1329:
449:
By contrast, the new style IMEI code 49-015420-323751-8 has an 8-digit TAC of 49-015420.
283:. The model and origin comprise the initial 8-digit portion of the IMEI/SV, known as the
1381:
891:
812:
487:
475:
465:
288:
114:
1491:
1479:
248:
118:
1382:"Does the Nigerian government want safety or surveillance with its new IMEI policy?"
280:
700:
83:
62:
1407:
471:
240:
1123:"U.S. Wireless Industry Launches Free Consumer Tool To Combat Smartphone Theft"
1211:"How spies used a shard of an exploded Nokia phone to expose the Bali bombers"
220:
47:
1308:
971:
748:
1090:
Wireless carriers partner with FCC, police on database of stolen cellphones
1101:
705:
133:(or one of several other regional administrators acting on behalf of the
1280:"Mission Accomplished! How to Register a Foreign Mobile Phone in Turkey"
674:
258:
185:
636:
4 + (1 + 8) + 0 + 2 + 5 + 8 + 2 + 0 + 3 + 4 + 3 + (1 + 4) + 5 + 2 +
146:
Optionally, it also adds the IMEI to shared registries, such as the
401:
In any of the above cases, the first two digits of the TAC are the
725:"3GPP TS 22.016: International Mobile Equipment Identities (IMEI)"
390:
Prior to 2002, the TAC was six digits and followed by a two-digit
266:
262:
29:
509:
Starting from the right, double every other digit (e.g., 7 → 14).
287:(TAC). The remainder of the IMEI is manufacturer-defined, with a
169:, actively check IMEI numbers of phones found involved in crime.
453:
406:
95:
59:
55:
1428:"These phones are tested and approved for the AT&T network"
917:"The Radio and Telecommunications Terminal Equipment Directive"
892:"What is an IMEI number? - Where Can You Find It? - Activation"
937:
79:
1092:. The Washington Post (2011-02-28). Retrieved on 2013-09-18.
216:
fled Saudi Arabia's patriarchal society in other countries.
772:""GSME proposals regarding mobile theft and IMEI security""
223:
was used to trace and identify the perpetrators behind the
1032:"Check whether your mobile handset has been blocked - TCF"
1356:"Everything about NTA's IMEI number registration program"
129:
Directive. Since that date, IMEIs have been allocated by
1154:"Inside The Massive Global Black Market For Smartphones"
1010:
274:
Structure of the IMEI and IMEISV (IMEI software version)
1230:"Mobile phone IMEI whitelisting in Chile and elsewhere"
1057:
916:
1080:
by Shani Hilton, Apr. 10, 2012, Washington City Paper
938:"How To Change IMEI, Device ID of Any Android Device"
870:"S.3186 - Mobile Device Theft Deterrence Act of 2012"
435:: 176148 - uniquely identifying a unit of this model
105:
Dual SIM enabled phones will have two IMEI numbers.
1482:, Version 5.0, 2010-09-01, chapter 2.1.5 vs. D.1.6
1078:Carriers to allow Customers to Brick Stolen Phones
486:The Check Digit shall be calculated according to
787:"How to activate license when no IMEI available"
653:= 8, so the complete IMEI becomes 49015420323751
219:An IMEI number retrieved from the remnants of a
18:International Mobile Station Equipment Identity
1117:
1115:
1113:
813:"Mobile Telephones (Re-programming) Act 2002"
505:The check digit is validated in three steps:
8:
456:) uses the same basic format as the IMEI.
452:The new CDMA Mobile Equipment Identifier (
425:(code 35) with the allocation number 2099
691:International mobile subscriber identity
649:To make the sum divisible by 10, we set
525:
304:
100:International mobile subscriber identity
1473:IMEI Allocation and Approval Guidelines
716:
480:IMEI Allocation and Approval Guidelines
40:International Mobile Equipment Identity
295:As of 2004, the format of the IMEI is
350:
165:Some UK Police forces, including the
7:
1305:"Mobile Devices Registration System"
1106:(Archived by WebCite Webcitation.org
749:"Phone firms defend security record"
515:Check if the sum is divisible by 10.
440:: 1 so it is a GSM Phase 2 or higher
211:Law enforcement and intelligence use
1508:Mobile telecommunications standards
1380:Nwokoma, Chimgozirim (2021-05-21).
1133:from the original on 20 August 2018
1011:"TCF – NZ Telecommunications Forum"
376:EE = Software Version Number (SVN)
148:Central Equipment Identity Register
94:Devices without a SIM card slot or
993:"Check the status of your Handset"
512:Sum the digits (e.g., 14 → 1 + 4).
25:
944:from the original on 19 July 2019
793:from the original on 19 July 2019
661:Usage on satellite phone networks
470:The last number of the IMEI is a
1408:"How to Activate a Sprint Phone"
354:D = Check Digit (CD) (Optional)
1388:from the original on 2021-05-24
1362:from the original on 2021-01-23
1336:from the original on 2016-08-17
1286:from the original on 2021-05-05
1261:from the original on 2018-07-27
1236:from the original on 2021-03-25
1166:from the original on 2013-09-17
1452:"Telus VoLTE (Voice over LTE)"
1354:Chand, Abhishek (2016-05-06).
1228:Epstein, Jeremy (2017-12-11).
1184:Bostock, Bill (12 June 2019).
173:any of these three operators.
71:MMI Supplementary Service code
1:
845:Latvian State Language Center
667:Broadband Global Area Network
27:Cellphone identification code
1330:"Register your mobile phone"
184:refers users to websites at
141:Blocklists of stolen devices
1152:Smith, Gerry (2013-07-13).
751:. BBC News. January 8, 2002
696:Mobile equipment identifier
421:: 35-2099 - issued by the
239:Prior to their merger with
167:Metropolitan Police Service
1529:
1406:Lloyd, Jack (2022-09-01).
681:terrestrial GSM networks.
635:
463:
265:also use an allowlist for
186:www.stolenphonechecker.org
1498:Mobile telecommunications
964:"FAQs on mobile security"
403:Reporting Body Identifier
383:
375:
369:
361:
353:
344:
34:IMEI number - an example
474:, calculated using the
460:Check digit computation
1104:Accessed: 2012-12-26.
503:
447:
35:
484:
414:
33:
1038:on 27 September 2016
478:, as defined in the
285:Type Allocation Code
1503:Checksum algorithms
1159:The Huffington Post
940:. 2 December 2016.
878:Library of Congress
581:Double every other
392:Final Assembly Code
301:AA-BBBBBB-CCCCCC-EE
1513:Unique identifiers
837:"The Criminal Law"
817:Legislation.gov.uk
297:AA-BBBBBB-CCCCCC-D
225:2002 Bali bombings
65:, as well as some
36:
1471:GSM Association,
1125:(Press release).
647:
646:
388:
387:
16:(Redirected from
1520:
1483:
1469:
1463:
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1368:
1367:
1351:
1345:
1344:
1342:
1341:
1326:
1320:
1319:
1317:
1316:
1307:. Archived from
1301:
1295:
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1276:
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1245:
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1190:Business Insider
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1081:
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1069:
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1054:
1048:
1047:
1045:
1043:
1034:. Archived from
1028:
1022:
1021:
1019:
1017:
1007:
1001:
1000:
989:
983:
982:
980:
979:
970:. Archived from
960:
954:
953:
951:
949:
934:
928:
927:
925:
923:
913:
907:
906:
904:
902:
888:
882:
881:
866:
860:
859:
857:
856:
847:. Archived from
833:
827:
826:
824:
823:
809:
803:
802:
800:
798:
783:
777:
775:
767:
761:
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739:
738:
736:
735:
729:
728:(ZIP/DOC; 36 KB)
721:
652:
643:
639:
628:
576:
526:
305:
289:Luhn check digit
109:IMEI and the law
75:
67:satellite phones
21:
1528:
1527:
1523:
1522:
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1517:
1488:
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1129:. 11 May 2017.
1121:
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997:prod.EIE.net.au
991:
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687:
678:satellite phone
663:
650:
641:
637:
626:
574:
468:
462:
441:
436:
431:
426:
276:
233:
213:
205:
194:IMEI blocklists
143:
135:GSM Association
111:
73:
46:) is a numeric
28:
23:
22:
15:
12:
11:
5:
1526:
1524:
1516:
1515:
1510:
1505:
1500:
1490:
1489:
1485:
1484:
1478:2012-09-08 at
1464:
1443:
1419:
1398:
1372:
1346:
1332:. 2016-08-10.
1321:
1296:
1282:. 2015-03-16.
1271:
1257:. 2017-09-06.
1246:
1220:
1217:. 3 June 2023.
1202:
1176:
1144:
1109:
1094:
1082:
1070:
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1023:
1002:
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955:
929:
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896:TechPayout.com
883:
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476:Luhn algorithm
466:Luhn algorithm
461:
458:
386:
385:
382:
378:
377:
374:
371:
368:
364:
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360:
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351:Serial number
349:
346:
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339:
338:
335:
332:
329:
326:
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314:
311:
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281:3GPP TS 23.003
275:
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212:
209:
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201:
142:
139:
115:United Kingdom
110:
107:
26:
24:
14:
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10:
9:
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3:
2:
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1480:archive.today
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1387:
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1357:
1350:
1347:
1335:
1331:
1325:
1322:
1311:on 2019-04-03
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1102:Checkmend.com
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1024:
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998:
994:
988:
985:
974:on 2013-05-22
973:
969:
965:
959:
956:
943:
939:
933:
930:
918:
912:
909:
897:
893:
887:
884:
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875:
871:
865:
862:
851:on 2012-03-14
850:
846:
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832:
829:
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