The phone serial number (IMEI) is stored in the phone's EEPROM (also known as the serial number). Each mobile device corresponds to a unique IMEI. The structure is TAC (6 digits) + FAC (two digits) + SNR (6 digits) + SP (1 digit ). TAC (device model approval number), which is assigned by the European model Certification Center. If you are familiar with and understand this number, it will play a very important role in identifying mobile phones in the future.
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, 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 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.
In addition, if the TAC code is different for a mobile phone of the same model, it indicates that the device has different hardware. For example, if NOKIA8210 is used, the TAC code of 8210 of the CPU of the old version is 448902, generally, the TAC code that can be written into the 8250 software version starts with 350. In fact, the first three of the TAC codes indicate the IMEI allocation time after the mobile phone FTA, and the real device model identification is the last three. In the two-hand market, JS usually uses the T20 motherboard to replace the T29 shell to pretend to be T29 for sale. However, the T20TAC code is 520259 and the real T29SC is 520341, therefore, when you get such a mobile phone, you only need to check the imei tac to be clear, but this does not mean that IMEI7, 8-bit has no effect, FAC (factory assembly code) is coded by the manufacturer, it usually indicates the manufacturer and Its Assembly location. This is also the number that we were most concerned about in the past, because it is generally used as the number to identify the origin, it can be very effective to help users identify the mobile phone source and authenticity. For example, NOKIA's 40/60 Earth people know that the origin is Beijing and Dongguan, as long as they are not both numbers are considered as parallel. In addition, if we use TAC, we can further understand the real identity of the machine. For example, we have mentioned T20/T29. We know that T29 is produced in Beijing, while T20 is produced in Nanjing, then, if the IMEI of A T29 is 520259-63... Haha ~~ It must be fake.
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 static, even products of the same origin, such as Siemens 3508I and MOTO C300, which have been upgraded from the initial 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 what model or brand it is, its 7 or 8 digits are all 00, such as the latest C289, samsung V200, Siemens A55, and Sony Ericsson T618 all showed 351*00 IMEI on their mobile phones. 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. hong Kong behavior 351253: The T618 on the Chinese mainland is 351254. In fact, it has already been explained that 351253 represents the T610 (Chinese traditional version), and 351254 is T618. The true meaning of the TAC code is here-the device model is approved.
Next we should say the SNR code. The SNR code is the serial number, which is also allocated by the manufacturer. Identifies a device in each TAC and FAC. The SNR of each mobile phone is not the same. simply put, this number indicates the order of the mobile phone production date. Generally, a larger value indicates that the later the model is released, so if there are six digits on the IMEI of a mobile phone that has just been listed, you should 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 to it when purchasing an ECS instance. Maybe this can be used as a good way to identify whether the mobile phone is modified by js imei.
SP backup code, as its name implies, is used for backup. There is only one note about SP that the current SP is basically not "generally 0" as described in previous articles, the phone number is set by the manufacturer and 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.
IEMI 7th bits
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
Beijing ---- 62
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
