Each cell phone has a unique number which is IMEI. You can find it by entering this code in your cell phone *#06# or see the back of your cell phone battery.
This IMEI number is something like this: ABCDEF-GH-IJKLMNO-X (without “-” characters)
For example: 350077523237513
In our example ABCDEF-GH-IJKLMNO-X:
AB is Reporting Body Identifier such as 35 = “British Approvals Board of Telecommunications (BABT)”
ABCDEF is Type Approval Code
GH is Final Assembly Code
IJKLMNO is Serial Number
X is Check Digit
As I told you in “http://soroush.secproject.com/blog/2009/01/credit-card-algorithm/” everything has an algorithm!
Here we have an algorithm to check valid IMEI number too, but the algorithm for IMEI number is as same as the credit card numbers!
You can check your IMEI numbers here for validation.