There is no new version or old version. . . . . If the IMEI numbers of the box and the machine are incorrect, you can ask the merchant to return or exchange the product for you. The price difference between parallel imports and licensed products is so big that we cannot suffer this loss. . . In addition, genuine licensed Sony Ericsson mobile phones can be registered on the Sony Ericsson website through their IMEI number to enjoy some value-added services for free. IMEI 7 and 8 digits generally represent the origin information. 00 means it is produced by the original factory. . The following is reproduced from the introduction to IMEI on the interactive encyclopedia IMEI code - Introduction Every mobile phone will be written with a unique electronic serial number when it leaves the factory, which is commonly known as the lMEl code. Its function is like the ID card of each of us. Same number. In the standby state, as long as the corresponding command key is pressed, the *#06# mobile phone will display the lMEl code. --------------------------IMEI code-overview IMEI is TAC + FAC + SNR + SP.
IMEI (International Mobile Equipment Identity) is the abbreviation of International Mobile Equipment Identity. The International Mobile Equipment Identity is an "electronic serial number" composed of 15 digits, which corresponds to each mobile phone one-to-one. , and the code is unique in the world.
Each mobile phone will be assigned a globally unique set of numbers after assembly. This number will be recorded by the manufacturer from production to delivery.
Its composition is:
1. The first 6 digits (TAC) are the "model approval number", which generally represents the model.
2. The next 2 digits (FAC) are the "final assembly number", which generally represents the place of origin.
3. The following 6 digits (SNR) are the "serial number", which generally represents the production sequence number.
4. The last digit (SP) is usually "0", which is the check code and is currently in use.
The IMEI code is affixed to the logo on the back of the phone and is read and written in the phone's memory. It is also the "file" and "ID number" of the mobile phone at the manufacturer.
Attachment: How to obtain the IMEI code of the mobile phone
If your mobile device is a mobile phone, you can press "*#06#" on the mobile phone to obtain the IMEI code of the mobile phone.
Perhaps the most familiar thing in the professional vocabulary of mobile communications is IMEI. Whether you are buying a new phone or "gold digging" in the second-hand market, the first thing you do when you get a mobile phone is to check the IMEI. Whether it is consistent with the IMEI on the motherboard of the fuselage is the main means of identifying authenticity. This article gives a brief introduction to some of the ins and outs and identification techniques of IMEI. I hope it can be helpful to everyone--------------------------------- ---------IMEI code-FTA test When it comes to FTA test, everyone will feel strange. It seems that it has nothing to do with the IMEI of mobile phones. In fact, all mobile phone manufacturers in order to make their mobile phones enter the market, All must obtain the international mobile equipment identifier (and this identifier is unique globally), which is the familiar IMEI (international mobile equipment identifier). Mobile phones without IMEI will not be able to be used in the GSM network. This IMEI is issued by the European Equipment Type Certification Center, a neutral certification agency authorized by the GSM MOU (the GSM Alliance, including GSM operators and GSM mobile phone manufacturers), based on the test report of the FTA certification laboratory. To obtain an IMEI number, you must pass certification testing by an FTA certified laboratory.
The full name of FTA test is FULL TYPE APPROVAL. The test was conducted based on the special mobile station conformance test specifications in the GSM series of standards formulated by the European Telecommunications Standards Institute (ETSI). The purpose of the test is mainly to check whether the mobile phone meets the requirements of the GSM standard. This standard has 1,500 pages. Depending on the functions supported by different mobile phones, 300 to 500 rigorous tests are required. The test content is divided into software testing, hardware testing and electromagnetic compatibility testing.
Mobile phones that have passed the FTA test are considered to have met the requirements of the GSM protocol and have the ability to be used in practical applications. Only then can they apply for and obtain IMEI and be produced as commodities. At the same time, for manufacturers, it also proves that their R&D capabilities have reached a certain level. Therefore, TFA testing is an important task for mobile phone manufacturers. Among domestic mobile phones, Southern Hi-Tech is the first mobile phone manufacturer in my country to obtain FTA certification.
After 2001, FTA changed from mandatory third-party comprehensive model certification to a final conformance test conducted by an authorized testing agency or manufacturer in accordance with the standards and rules listed in the GSM Recognition Forum, and the manufacturer conducted the conformance test. Declaration of conformity and full responsibility for product quality.
Since my country implements the GSM terminal network access license system, the GSM terminal equipment applying for network access should not only comply with national industrial policies and technical standards, have a complete quality assurance system and after-sales service, but also provide effective Final conformance test report and approved IMEI number. Therefore, in this sense, FTA certification is necessary. Without certification, you cannot obtain IMEI. Without these two procedures, you cannot obtain a network access license in our country. Those without a network access license are of course parallel imports of unknown origin. -------------------------------------------------- --------IMEI code-IMEI composition IMEI commonly known as "serial number" is stored in the EEPROM (commonly known as chip) of the mobile phone. Each mobile device corresponds to a unique IMEI. Its composition structure is TAC (6 digits) + FAC (two digits) + SNR (6 digits) + SP (1 digit). TAC (Type Approval Number), assigned by the European Type Approval Center. If we are familiar with and understand this number, it will play a very important role in identifying our mobile phones in the future. First of all, the first three digits of the TAC code will change in different periods. The first three digits of the past TAC code will not appear on current mobile phones. Some old models of mobile phones in the past basically started with 446/448, such as moto v328 and nokia 7110, and even the same mobile phone would have different TAC codes at different times, such as the most familiar 8210 and upgrade to 8250. If the first three If the bit is 448902, it cannot be upgraded because the CPU is different. Therefore, it is not accurate enough to say that the TAC code of mobile phones of the same model must be the same in the past. For example, Ericsson's T39MC mobile phone of the same model will also have different numbers in different regions. In mainland China, it is 520406, while in Hong Kong, it is 520407. After we know these differences, we can use the TAC code to perform "device identification" without having to worry about remembering the origin represented by the 7.8-digit number of the IMEI.
In addition, if the TAC codes of the same model of mobile phones are different, at least it means that the phones are different in hardware. For example, the NOKIA8210 uses an older version of the CPU. The TAC code of the 8210 is 448902, and it can generally be written to the 8250 software. The version TAC code starts with 350. In fact, the first three digits of the TAC code represent more of the time when the IMEI is assigned after FTA of the mobile phone. The real device model identification is still the last three digits. In the second-hand market, JS usually replaces the T20 motherboard with the T29 casing and sells it as a T29. However, the T20 TAC code is 520259 and the real T29SC is 520341. Therefore, when you get such a phone, you only need to check the IMEI TAC. Although it is familiar, it does not mean that IMEI7 and 8 bits have no effect. FAC (Factory Assembly Code) is encoded by the manufacturer and usually indicates the manufacturer and its assembly place. This is also the number we paid most attention to in the past, because it is generally used as a number to identify the place of origin, and it can be very effective in helping users identify the source and authenticity of a mobile phone. For example, everyone in the world knows that NOKIA's 40/60 products are produced in Beijing and Dongguan. As long as these two numbers are not used, they are considered parallel imports. And if we combine it with TAC, we can further understand the true identity of the machine. For example, as mentioned before about T20/T29, we know that T29 is produced by Ericsson in Beijing and T20 is produced in Nanjing. So if the IMEI of a T29 is 520259- 63. . . Haha~~ Then it must be a fake.
Sometimes FAC cannot completely prove whether the mobile phone is licensed. After the T68 was launched, it was sold out due to hot demand. Therefore, Ericsson agents mobilized a part of the Malaysian production (FAC code 71) for emergency rescue, so this part has access to the network. License T68 is also "licensed". (We have talked about the connection between IMEI and obtaining a network access license before.) However, it should be pointed out that this part of T68 is limited to some early T68s with software version R1B.
FAC codes are not static even for products from the same origin, such as Siemens 3508I and MOTO C300, which have been upgraded from 37 to 40 due to their huge production, and the licensed FAC of C300 also has 80/81/82 . What is particularly important is that the European Type Approval Center redistributed IMEI this year. FAC was merged with TAC. The numbers of FAC code uniformly start from 00, so no matter what model or brand, the 7th and 8th digits are 00, such as the latest C289 , Samsung V200, Siemens A55, and Sony Ericsson T618 all have IMEIs like 351***00 on their mobile phones. Fortunately, we have the TAC code identification method introduced earlier. For example, although the IMEI of T618 in the past was unified to 00, there are still differences in the last three digits of the TAC between Hong Kong and mainland China. The Hong Kong Bank's 351253 mainland T618 is 351254. In fact, a problem has been explained here. 351253 represents T610 (Chinese traditional version) and 351254 is T618. The real meaning of the TAC code is here - equipment model approval.
Next it’s time to talk about SNR codes. The SNR code is a serial number and is also assigned by the manufacturer. Identifies a device in each TAC and FAC. The SNR of every mobile phone is different. Simply put, this number can indicate the production date of the mobile phone. Usually, the larger the number, the later the model was manufactured. So if a 6-digit number appears on the IMEI of a mobile phone that has just been launched, you have to be careful. Because the SNR of mobile phones that have just been launched will not exceed four digits at most, so you can pay attention to it when purchasing. Maybe this can be one of the good ways to identify whether the IMEI of the mobile phone has been modified by JS.
SP backup code, as the name suggests, is used for backup. There is only one thing to note about SP. Today’s SP is basically not “generally 0” as mentioned in previous articles. Its number is set by the manufacturer. Can be ignored.
Of course, some mobile phones have their own definitions on IMEI. When Ericsson mobile phone is in standby, enter *#06# and a 17-digit IMEI will appear. The last two digits are mainly used to identify the software version. What needs to be explained here is that Samsung V200 has also started to use 17-bit IMEI. The last two digits are mainly used to identify the software version. Generally speaking, the lower the value, the lower the version. For example, the R1A version of T618 is 02 and the R1F version Then it is 03, and the latest R1L version is 05.
We have already mentioned that each mobile station device has an equipment identification code (IMEI). If the mobile station device is allowed to enter the operation network, it must be approved by the European Type Certification Center and assigned to a decimal 6 digits, occupying the first 6 digits of the 15-digit decimal number of IMEI. In fact, the function of device identification is to ensure that the mobile station equipment used in the system is not stolen or illegal. The identification of the device is completed in a device called the device identification register EIR, and the IMEI is stored in the EIR. There are three types of lists in the EIR: white list---including all equipment identification serial numbers that have been assigned to GSM countries that can participate in operation. Blacklist --- Contains all device identifiers that should be disabled. Graylist --- includes faulty and non-type certified mobile station equipment, determined by the network operator.
The following is a brief introduction to the device identification process in mobile communications. When a mobile phone user initiates a call, the Mobile Switching Center (MSC) and the Visitor Location Register (VLR) request the IMEI from the mobile station (mobile phone) and send it to the mobile station (mobile phone). It is sent to the EIR, and the EIR compares the received IMEI with the white, black, and gray tables, and sends the results to the MSC/VLR so that the MSC/VLR can decide whether to allow the mobile station device to enter the network.
Therefore, if the mobile station uses a stolen mobile phone or a faulty mobile device that has not been model-certified, MSC/VLR will determine the location of the stolen mobile station and block it. It can also take action against the faulty mobile station. timely preventive measures. What we usually call tracking stolen mobile phones through network trackers is achieved through EIR. At present, network operators such as Vodafone have begun to use this service to monitor stolen mobile phones. It is a pity that my country basically does not use EIR to identify IMEI, and if the stolen mobile phone changes the network and changes the IMEI, EIR will be unable to do anything.
In fact, IMEI, which is used as the "ID card" of mobile phones, has other uses. For example, if the registration of Samsung's Samsung Park is not through formal channels, the mobile phone will not be able to enjoy the registration of this service. The same is true for Sony Ericsson's registration. For mobile phone users, IMEI can also be registered through IMEI on some manufacturers' websites to enjoy free downloads of pictures, ringtones, and animated screensavers. IMEI will even be recorded in the customer service center as the user's basis for maintenance and upgrades. Therefore, in this sense, IMEI will play an increasing role in future mobile communications.