IMEI of mobile phone device ID

Source: http://baike.baidu.com/view/90099.htm

Preface
IMEI (International Mobile Equipment Identity) is the abbreviation of international mobile device identity code. It is an "electronic serial number" consisting of 15 digits ", it corresponds to each mobile phone, and the code is the only one in the world. Each mobile phone is assigned a unique group of numbers in the world after it is assembled. This number will be recorded by the manufacturer who manufactures it from production to delivery. Introduction

The international mobile device identification code (IMEI: internationalmobileequipmentidentifnumber) is the identifier for distinguishing mobile devices. It is stored in mobile devices and can be used to monitor stolen or invalid mobile devices. As shown in IMEI composition, mobile terminal devices can be queried by typing "* #06. Total
The length is 15 digits, and each number is 0 ~ 9. Tac indicates the model assembly code, which is allocated by the European model standard center; FAC indicates the Assembly manufacturer number; SNR indicates the product number, which is used to distinguish each mobile device in the same TAC and FAC; SP is a backup code.

IMEI, also known as the "Serial Number", is stored in the phone's EEPROM (also known as the serial number). You are familiar with and understand this number will play a very important role in identifying mobile phones in the future. First, the first three of the TAC codes will change in different periods, and the first three of the past TAC codes will not appear on the current mobile phone. In the past, some old mobile phones started with 446/448, for example, Moto v328 Nokia 7110, in addition, even if a mobile phone has different TAC codes in different periods, for example, the most familiar 8210 upgrade 8250, if the first three are 448902, it cannot be upgraded because the CPU is different. Therefore, it is not accurate to say that the TAC code of a mobile phone of the same model is the same. For example, t39mc of a mobile phone of the same model of Ericsson may have different numbers in different regions: the number of goods in mainland China is 520406, while that in Hong Kong is 520407. Once we know the differences, we can use the TAC code to identify the device, instead of having to worry about the origin of IMEI's 7.8-bit number. IMEI allocation

IMEI codes are centrally allocated by the GSM (Global Mobile Communications Association) and authorized to be reviewed by babt (UK communications Certification Board ).

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IMEI Composition

IMEI consists of 15 digits, which are:

1. The first six digits (TAC) are "model approval numbers", which generally represent models.

2. The next two digits (FAC) are the "last Assembly number", which generally represents the origin.

3. the next 6 digits (SNR) are "serial numbers", which generally represent the production sequence numbers.

4. the last 1-digit (SP) is usually "0", which is the Verification Code and is currently in use.

The IMEI code is unique and attached to the logo on the back of the mobile phone. It is read and written to the memory of the mobile phone. It is also the "file" and "ID card number" of the mobile phone in the manufacturer ".

Tac

TAC (device model approval number) is assigned by the European model Certification Center. The first three of the TAC codes will change in different periods, and the last three will not appear on the current mobile phones. In the past, some old mobile phones started with 446/448, for example, Moto v328.
Nokia 7110, and even a mobile phone may have different TAC codes in different periods. For example, if the first three digits are 8210, they cannot be upgraded, because the CPU is different. Therefore, it is not accurate to say that the TAC codes of the same phone model are the same in the past, in addition, for example, t39mc of the same mobile phone model of Ericsson may have different numbers in different regions. For example, if the number of mainland China products is 520406, the value of Hong Kong is 520407. Once we know the differences, we can use the TAC code to identify the device, instead of having to worry about the origin of IMEI's 7.8-bit number.

FAC

FAC (factory assembly code) is coded by the manufacturer. It usually indicates the manufacturer and Its Assembly location. Sometimes FAC cannot completely prove whether the mobile phone is licensed. After T68 went public, hot purchases once caused a shortage. Therefore, Ericsson agents mobilized some Malaysian production (FAC code 71) for emergency rescue, therefore, this part has a network access license T68 is also "Licensed ". (We have mentioned the connection between IMEI and the network access license.) However, it should be noted that this part of T68 is limited to T68 of the previous software version r1b.
FAC

Code is not the same, even products of the same origin, such as Siemens 3508i and Moto c300 have been upgraded from 37 to 40 because of their huge output, c300 FAC also has 80/81/82. In particular, the European model Certification Center has re-allocated IMEI this year. The FAC and TAC are combined, and the FAC code numbers start from 00, therefore, no matter which model or brand it is, its 7 or 8 digits are arranged backward like 00, 01, 02, or 03. Such as the latest c289, Samsung v200, Siemens A55,
Sony Ericsson's t618 mobile phones all showed up with IMEI like 351 *** 00. Fortunately, we have previously introduced the TAC code identification method. For example, although the IMEI of t618 is now unified as 00 in the past, there are still differences between Hong Kong and Mainland China after tac. port behavior 351253: The t618 in mainland China is 351254. In fact, a problem 351253 represents the t610 (Medium

(Traditional Chinese Version) 351254 is t618. The true meaning of the TAC code is here-the device model is approved.

SNR code

The SNR code is the serial number, which is also allocated by the manufacturer. Identifies a device in each TAC and FAC. Each

The SNR of mobile phones is not the same. simply put, this number indicates the order of the mobile phone production date. Generally, the larger the value, the later the factory time of the model is, so if there are six digits on the IMEI of a mobile phone that has just been listed, you have to be careful, because the SNR of a mobile phone that has just been listed will not exceed four digits at most, you can pay attention when purchasing a machine. Maybe this can be used as a good way to identify whether the mobile phone is modified by js imei.

SP standby code

SP backup code. The current SP is basically not "generally 0" as described in the previous article. The number is set by the manufacturer, which can be ignored.

Of course, some mobile phones have their own definitions on IMEI. when the Ericsson mobile phone is in standby mode, enter * #06 # to display a 17-bit IMEI. The last two are mainly used to identify the software version. It should be noted that the Samsung v200 has also started to use 17-bit IMEI. The last two are mainly used to identify the software version. Generally, the lower the value, the lower the version, for example, the r1a version of t618 is 02, the r1f version is 03, and the latest r1l version is 05.

Function

IMEI is TAC + FAC + SNR + sp. IMEI (International Mobile Equipment Identity) is an international

The abbreviation of mobile device identity code, an international mobile device identification code, is an "electronic serial number" consisting of 15 digits. It corresponds to each mobile phone, this code is the only one in the world. Each mobile phone is assigned a unique group of numbers in the world after it is assembled. This number will be recorded by the manufacturer who manufactures it from production to delivery.

View Method

Enter * #06 # on the mobile phone to enter these five key characters, a line of Arabic numbers will appear on the mobile phone screen, that is, the serial number of the mobile phone.

The above method is for GNET mobile phones, but for CNET mobile phones, the above method cannot be viewed.

IMEI seven-eight-digit meaning

Samsung

South Korea ----, 92

Panasonic

Beijing ---- 62

Siemens d

Shanghai ---- 37

Germany ---- 51

Motorola

Tianjin ----,

Germany ---- 07,08, 06 (Part)

Singapore ---- 18

UK ---- 44

Modified machines in Hong Kong and Southeast Asia ---- 47

Modified machines in mainland China ---- 48

Hangzhou Dongxin, China ---- 92,93

USA ---- 67,68

Malaysia ---- 17

Scotland ---- 40, 41

Ericsson

UK ---- 19

Hong Kong ---- 61

Malaysia ---- 71

Estonia ---- 42

Nanjing ---- 63

Sweden ---- 51

Nokia

China ---- 40 (Beijing), (Dongguan), 93

France ---- 06, 07, 08

South Korea ---- 30 9

Singapore ---- 18

Germany ---- 20

Finland ---- 10, 70

USA ---- 67,68

UK ---- 19,41, 44

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Currently, 78 are not from the origin site. The first batch of 78 are certainly 00 or 01. The first half of is generally 02, And the 78 digits are not produced at all, currently, the latest version of both products are 03, except for the 01 or 02 version of the refurbished product. Now 6120ci is out of 04 (e63 is also out of 04 ).