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The SNR is an individual serial numberthatuniquely identifies each Mobile Equipment device within theTAC.The Spare digit is used as a Check digit to validatetheIMEI and is always set to the value 0 when transmittedbythe Mobile Equipment.
In this regard, what does an IMEI number tell you?
IMEI numbers have one principal purpose:Toidentify mobile devices. IMEI numbers are hard-codedintodevice hardware, making it nearly impossible to change themwithoutsomehow damaging the device. When a carrier knows that adevice hasbeen stolen, it can blacklist the IMEI codeand lockit out of the network.
Also to know, what is the format of IMEI number?
The Structure of an IMEI Number IMEI numbers either come in a 17 digit or15digit sequences of numbers. The IMEI formatcurrentlyutilized is AA-BBBBBB-CCCCCC-D: AA: These two digits arefor theReporting Body Identifier, indicating the GSMA approvedgroup thatallocated the TAC (Type AllocationCode).
your mobile is dual sim that is whyithave two imei number. normally master imei number1stimei number is used for your mobile. as you havetwosim card and to register on gsm network each sim needuniqueimei number and that is why it has twoimeinumber. imei is very useful for mobile trackingandmobile unlocking.