You are here: Home Mobile Articles How IMEI code works?

How IMEI code works?

Probably you have seen the word “IMEI”, when you make a Google’s search looking for how unblock a specific mobile device.  The IMEI code is a numerical sequence that uniquely identifies all kind of mobile devices around the world.  The main reason why mobile phones contain an IMEI code is for identification purposes.  Furthermore, this number can provide a wide range of advantages for manufacturers, retailers and even general users. In many countries around the world you can find that have been solved a ton of crimes through the propel identification of the IMEI code.  In this article you’ll learn more in depth how IMEI code work and all about this important issue.

Simple and Complex composition of the IMEI Number:
Don’t be afraid about the term “complex” because I just will try to make a detailed description about how it works and which are the most common elements that form part of the IMEI code. Avoiding all kind of complications and complexities let’s see now a very informative description about this issue. IME number is a sequence of 14 or 16 digits.  The difference between the one and the other consists basically in the type of IMEI.  There are two kinds of IMEI numbers but the most common is the one based in 14 numbers or digits (we say numbers because IMEI is always a numeric sequence).  The code which has a sequence of sixteen (16) digits is described as IMEISV and the sequence having fourteen (14) digits is described as IMEI.

Let’s talk about the structure of the IMEI number in your mobile device:
Almost all kind of codes you see on the earth contains a structure.  This structure can explain some important information for the designer and for other experienced users.  For example: if I design two kinds of computers. The first is named HEC and the second is named NIC and I should set a code for indentify each computer manufactured for identification purposes in the present and future.  I can choose some important elements for establish this code such as manufacturing date, type of processor and speed of the processor.  When I manufacture my two first computers (HEC and NIC) I could establishes two different sequence of code for them. HEC2008PEN09-2.0 and NIC2007AMD02-2.8.  This structure stands for: the name of the equipment (HEC or NIC), the manufacturing year (2008 or 2007), the type of processor (PEN-PENTIUM, AMD-AMD), the speed of the processor (2.0 or 2.8).

In a very similar way is presented code structure of the IMEI code in your mobile device. The sequence of numbers is described in group of letters according to the position of each number.  For example: the first 8 positions (AA-BBBBBB) stand for “Type Allocation Code” (TAC) where the “AA” is the body identifier and the group of “BBBBBB” in the remaining codes that indentify the TAC.  Then will appear the group “CCCCCC” that identifies a serial sequence in the model.  The following group is the unique “D” representing the “Luhn Algorithm” and consists in a simple sum that verifies if the previous numbers are correct. And finally the last group is the “EE” which identify the version of the software used for this Mobile Phone.

 

 
Symbol