What is imsi subscriber number? What do the numbers on the SIM card mean? What does the serial number mean?

International Mobile Subscriber Identity (IMSI) - international identifier mobile subscriber(individual subscriber number) associated with each user mobile communications GSM, UMTS or CDMA standard. When registering on the network, the subscriber’s device transmits an IMSI, which is used to identify it. To avoid interception, this number is sent over the network as infrequently (user authentication only) as possible - in cases where this is possible, a randomly generated TMSI is sent instead.

In the GSM system, the identifier is contained on the SIM card in an elementary file (EF) with the identifier 6F07. The format for storing IMSI on a SIM card is described by ETSI in the GSM 11.11 specification. In addition, IMSI is used by any mobile network connected to other networks (particularly CDMA or EVDO) in the same way as in GSM networks. This number is associated either directly with the phone or with an R-UIM card (analogous to a GSM SIM card in the CDMA system).

The IMSI length is typically 15 digits, but can be shorter. For example: 250-07-ХХХХХХХХХХ. The first three digits are MCC (Mobile Country Code, mobile code countries). In the example, 250 is Russia. It is followed by MNC (Mobile Network Code, code mobile network). 07 from the example - SMARTS. The mobile network code may contain two digits according to the European standard or three digits according to the North American standard. All subsequent numbers are directly the user ID MSIN (Mobile Subscriber Identification Number).

IMSI analysis

IMSI analysis is the process of determining whether a subscriber belongs to a network, as well as checking whether a subscriber of this network is allowed to use the services of the network in which he is located.

If the subscriber does not belong to the network in which he is located, the IMSI identifier must be translated into MGT format so that data on it can be obtained from any remote registry. The E.214 standard regulates the mechanism for translating this number into a number, which can then be used for routing in international SS7 networks. Within North America, the IMSI can be translated directly to an E.212 number without modification and can be routed directly to one of the US SS7 networks.

For CDMA operators in roaming, the first 4 digits of (MIN for GSM MSIN) are IRM (International Roaming MIN), and the rest is the subscriber identifier in the network.

Russian mobile network codes

International Mobile Subscriber Identity (IMSI) - an international mobile subscriber identifier (individual subscriber number) associated with each GSM, UMTS or CDMA mobile communications user. When registering on the network, the subscriber’s device transmits an IMSI, which is used to identify it. To avoid interception, this number is sent over the network as rarely as possible - in cases where it is possible, a randomly generated TMSI is sent instead.

In the GSM system, the identifier is contained on the SIM card in an elementary file (EF) with the identifier 6F07. The format for storing IMSI on a SIM card is described by ETSI in the GSM 11.11 specification. In addition, the IMSI is used by any mobile network connected to other networks (particularly CDMA or EVDO) in the same way as in GSM networks. This number is associated either directly with the phone or with an R-UIM card (analogous to a GSM SIM card in the CDMA system).

The IMSI length is typically 15 digits, but can be shorter. For example: 250-07-ХХХХХХХХХХ. The first three digits are MCC (Mobile Country Code). In the example, 250 is Russia. It is followed by MNC (Mobile Network Code). 07 from the example - SMARTS. The mobile network code may contain two digits according to the European standard or three digits according to the North American standard. All subsequent numbers are directly the user ID MSIN (Mobile Subscriber Identification Number).

IMSI follows the ITU E.212 numbering standard.

MNC
Code	Operator	Brand	Owner
01	PJSC "Mobile TeleSystems"	MTS	PJSFC Sistema
02	PJSC MegaFon	Megaphone	AF Telecom Group
03	CJSC "Nizhny Novgorod Cellular Communications"	NSS	PJSC Rostelecom
05	CJSC "Yeniseitelecom"	ETC	PJSC Rostelecom
06	CJSC Saratov Cellular Communication System	Sky Link	50% PJSC Rostelecom
07		Fly	PJSC "Tattelecom"
08	JSC "Vainakh Telecom"	Vainakh Telecom
09	CJSC "Sky Link"	Sky Link	100% of shares belong to PJSC Rostelecom
10	CJSC "Dontelecom"	DTC	MNC is not used
11	Scartel LLC	YOTA	PJSC MegaFon
12	CJSC "Baikalwestcom"	BVK	PJSC Sibirtelecom
13	CJSC Kuban-GSM	KUGSM	Purchased by PJSC Mobile TeleSystems" and this MNC is not used
14	PJSC MegaFon	Megaphone	"Olympic Code" of the MegaFon operator.
15	PJSC "SMARTS"	SMARTS-Ufa, SMARTS-Ulyanovsk	The main owners are private individuals
16	LLC "Miatel"	MIATEL	LLC "MiATel"
17	PJSC Uralsvyazinform	Utel	Purchased by PJSC Rostelecom and this MNC is not used
20	T2 RTK Holding LLC	Tele2	PJSC "Rostelecom"
23	Mobicom	Mobicom	Not used
27	LLC "Your Mobile Technologies"	Fly	PJSC "Tattelecom"
28	PJSC "Vympel-Communications"	Beeline	Not used
35	LLC "Ekaterinburg-2000"	MOTIVE	No data
38	PJSC Rostelecom	Tambov-GSM	Purchased by PJSC Rostelecom from PJSC CenterTelecom
39	PJSC Uralsvyazinform	Utel	Purchased by PJSC Rostelecom and used as the base network code
42	OJSC “Multiregional TransitTelecom”	MTT Russia
62	Tinkoff Mobile LLC	Tinkoff	JSC Tinkoff Bank
99	PJSC "Vympel-Communications"

IMSI analysis

For CDMA operators in roaming, the first 4 digits of (MIN for GSM MSIN) are IRM (international roaming min), and the rest is the subscriber identifier in the network.

Notes

Links

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IMSI See what "IMSI" is in other dictionaries:

IMSI- Para para la técnica de fecundación in vitro abreviada IMSI, véase Inyección intra citoplasmática de espermatozoides morfológicamente seleccionados. IMSI es el acrónimo de International Mobile Subscriber Identity (Identidad Internacional del... ... Wikipedia Español

IMSI- International Mobile Subscriber Identity L’International Mobile Subscriber Identity (IMSI) est un numéro unique, qui permet à un réseau GSM ou UMTS d identifier un usager. Ce numéro est stocké dans la carte SIM respectivement USIM et n est pas… … Wikipédia en Français

IMSI- Die Abkürzung IMSI steht für: International Mobile Subscriber Identity Intracytoplasmic Morphologically Selected Sperm Injection Category: Abkürzung … Deutsch Wikipedia

Many people know that a certain subscriber identifier called IMSI is stored on the SIM card. And that each subscriber has his own IMSI, unique. At the same time, if you remove the SIM card from the phone, you can see another number on it, which only partially matches the IMSI. What are these numbers, how do they differ, and why do they have common substrings of numbers?

Let's start with a piece of plastic with a built-in microprocessor called a SIM card. It is a private member of a larger class of microprocessor-based devices called smart cards. In accordance with international standard ISO/IEC 7812 assigns a unique number to each such card, called Integrated Circuit Card ID(ICCID):

As you can see, this number, consisting of 19 digits (although there are also very old cards with 20-bit ICC ID), in turn can be broken down into individual components. The first two digits are the industry code, which for telecom is always 89. Next comes the country code, from one to three characters long, and the code of the organization that issued the card. This 7-digit prefix is called Issuer Identification Number (IIN). In the example given, the country code is 380 (Ukraine), the issuing organization code is 01 (UMS CJSC).

The remainder of the ICCID is the individual card number (unique within a given IIN), followed by a single digit used to verify the correctness of the IIN using a simple algorithm. An individual card number may be assigned by the issuing organization at its sole discretion.

Now let's move on to IMSI.

This is a 15-digit number that (surprise!) can be divided into its individual components. The first is the country code within the GSM infrastructure, called the Mobile Country Code (MCC). The second is the mobile network code within the country, Mobile Network Code (MNC). Next come 10 characters, which, in fact, are the MS (subscriber) identifier within the network. In the example given, MCC = 255 (Ukraine), MNC = 01 (UMS CJSC).

What does this lead to in practice?

Firstly, if the operator is doing well and has connected more than 10 10 -1 subscribers, he needs to obtain a new MNC from the standardizing authorities;)

Secondly, for everything to work and the phones to ring, the operator must always be able to determine within its network which HLR contains information about subscribers. Here an obvious optimization suggests itself - to interpret the first few digits of the MS identifier as an indication of which HLR contains information about this subscriber. In this case, the routing of requests to HLRs is described simple rules like: “all inquiries about subscribers 2550198* should be directed to HLR #98.”

Now let’s imagine the whole process of issuing new cards and attracting new subscribers. The operator decided to issue new cards. It sends the order to SIM card manufacturers. Manufacturers send containers with physical SIM cards (where IMSIs are already registered) and secret data about them encrypted a hundred times over (the notorious Ki-codes and the like). Secret data is loaded into the operator's secret information systems, and SIM cards are sent to stores, dealers, etc.

It is clear that at the moment when a newly connected subscriber inserts a SIM card into the phone, it must already be correctly “registered” in HLR (otherwise the subscriber will not be able to register on the network). It turns out that data about all new SIM cards must be immediately placed in HLRs. What if SIM cards are not sold for a long time? Then data about them will take up valuable space in the HLR database. You can throw out cards for sale in portions, or even when actually selling a SIM card to a subscriber, press a button in some interface, and on demand, load card data into HLR individually.

In order to carry out such optimizations, it is useful to know which ICCID (which can be read on the box with the SIM) corresponds to which IMSI. It is clear that for information systems This is not a tricky thing - a sign is created (ICCID, IMSI), and that's the end of it. But for people it’s easier for ICCID and IMSI to be similar. That is why, when ordering SIM cards, the operator usually asks that, for example, the last 10 digits of IMSI and Individual ID in ICCID match.

Please provide clarification. Where does the bank get information about changing the IMSI SIM number user cards? This information is confidential and is available only from the telecom operator. The telecom operator issues a unique IMSI SIM card number to third parties only upon an official request from authorized bodies (for example, police, court). The fact is that you receive SMS messages about transactions (including messages with one-time passwords) from the bank to a phone with a SIM card, the number of which (the so-called IMSI) is known to the bank. A person using a different SIM card with the same phone number but a different IMSI number will not be able to receive these messages. As a rule, re-registration of an IMSI number is carried out in the following cases:

If you have changed your SIM card from your mobile operator to a new one.
If you used the “Spare SIM card” service of your mobile operator and activated the spare SIM card.

If it is necessary to re-register an IMSI number, when performing operations that require verification of the IMSI number (for example, in Sberbank Online), you will receive an SMS message with the following content: “Sberbank Online. Due to the replacement of the SIM card, the SMS password cannot be sent to this number. Please contact the Sberbank Contact Center by phone 8-800-555-5550. When applying, you will need a passport and a receipt for any transaction made at an ATM or point of sale using your bank card.” The message will remain until you complete the IMSI number re-registration procedure. If you receive information about transactions on several phones (“linked” to one card), then the information will be delivered to all phones that have passed the IMSI check; to phones that have not passed the IMSI check, an SMS will be delivered about the need to re-register the IMSI number.

Every cellular user has noticed that the SIM card does not always indicate the phone number, but there are other digital codes. Also, when replacing a SIM card or operator with their number, the subscriber receives a new card on which the main number is not indicated, and the remaining designations differ from those on the old card.

Today we will tell you what kind of identification numbers are written on SIM cards: what they are for, what they mean, and how they differ on MTS, Beeline, and MegaFon.

What is indicated on the SIM card

When receiving a new SIM card, the subscriber is issued a card by the mobile operator, the size of which is identical to a bank card. Usually we just break out the chip of the required size, install it in the phone, and start using the connection.

Not all users attach importance to the so-called plastic base that frames the SIM card itself, and often throw it away. However, it is on a plastic basis that it contains important information, some of which, of course, are not useful for the subscriber to use and are of a purely technical nature. However, the SIM card itself also contains useful information.

In recent years, SIM cards have evolved significantly, and first of all, their size has changed. Most modern gadgets use the nano format. However, even on such a small piece of plastic with a built-in chip, the operators indicate not only the operator’s logo, but also the unique serial number of the SIM card, the numbers of which are different for the sim of Beeline, MegaFon, or another operator.

First, let's talk about the information indicated on the plastic base of the SIM card and how it can be useful. Surely you have noticed that operators began to issue cards divided into two parts. The first contains a chip, and the second contains basic information about the operator. Operators recommend separating the second part of the card and saving it.

What is so useful indicated on it? Here the subscriber can receive basic information about the operator, including the Internet portal, number contact center. If a subscriber is just starting to use the operator’s services, then such information will be useful - how to get advice, quickly check the balance, or the balance of package services.

Also on this part of the card is the number itself, which can be placed in the form of a sticker, and personal SIM codes. Depending on the operator, there may be two or four.

The first pair of codes must be present on SIM cards of any operator - these are PIN and PUK. In recent years, when activated new card, PIN is not enabled by default, but you can enable its request. This will avoid unauthorized access to the number if the SIM card falls into the wrong hands.

Many will ask: why an additional code if the SIM card is protected on the device with a password, or even access by fingerprint? To gain access to a SIM card, just install it in another phone, and it will work without a pin. If you activate the PIN request, access will be impossible without entering it.

Today, operators release SIM cards with an initial pin of four zeros or ones, but the pack is always unique. The fact is that the pin can be changed, which will protect your SIM card. The PUK cannot be changed, and if it is entered incorrectly ten times, the card is completely blocked. To restore access, you do not need to change the card itself, but simply request a PUK code from the operator.

The second pair of codes is not specified by all operators. PIN2 and PUK2 are used to work with additional operator services. Thus, activation of individual services through the device menu is available only when entering PIN2, and PUK2 is used like the first if you have forgotten your PIN code.

What does the serial number mean?

The serial number is used not only in the production of SIM cards, but also in most other technical products. Thus, any mobile gadget can be identified not only by its imey code, but also by its serial number. It encrypts information about the manufacturer, and even the release date.

On SIM cards the serial number is designated ICCID. What do the numbers in this ICC SIM mean, and why is it indicated on the SIM card itself, where is the chip located, and how do they differ on MTS, MegaFon, or Beeline?

This code has a uniform standard throughout the world, and by it you can not only determine the country, but also the cellular operator. Regardless of the company that issued the SIM card, as well as the country, the ICC always begins with the number 89. Next is the country code, so on Russian SIM cards it is always a seven. Depending on the country, this part of the code can contain from one to three digits.

After that the identifier is indicated mobile operator, consisting of two to four digits. However, there is a peculiarity that, together with the country code, it forms a five-digit number. Accordingly, all Russian mobile communication providers have codes consisting of four digits.

Next comes eleven digits, which can be considered the identifier of the SIM card itself. This sequence is determined by operators according to their own rules, which do not have a common standard. Using this code, the physical SIM card is linked to the operator’s software ID. The last number or letter is the check number.

The operator writes another code into the SIM card itself - IMSI, which serves as an identifier for each specific subscriber. It contains information about the country, mobile operator, and subscriber number. The code consists of fifteen digits.

It is thanks to IMSI that the binding occurs cell number to a plastic card with a chip used to receive cellular services. So, if you contact the operator to replace or get a new SIM card, then the store will take a free SIM card that is not tied to a specific number. The operator's employee assigns a subscriber number identifier to it, and after processing the information in the system, the IMSI is linked to the received card.