How imei networksim locking works

How mobile imei and network sim locking & unlocking working principle :-

           Here I explain you how mobile locking done at imei level by sim network service provider or gsm service provider.
           Lg, Samsung, nokia, Motorola all mobile companies spend millions on research and development. Now a days every months new mobile launch and most of the time this mobile sell with locked condition. Then people start looking for unlocking codes for lg, Samsung etc.

          before continue heere is a brief detail of imei no.
           Imei stand for international mobile station equipment identity. It is 15 or sometime 16 digit number. Each mobile has unique imei number.
   Mobile Imei number consist of 4 part 

  •   tac/type approved code which is of 8 digit,
  •   Final assembly code /fac, 
  •   Serial number/snr  this is assigned within tac,
  •   Spare dight /sp. 
 imei = tac & snr + fac +sp = 15 digit.

           If you have proper knowledge of mobile locking then you can easily unlock it from imei generated code. At other post of this blog I have explained that how mobile unlocking done without unlocking codes, and I have given all details about  Samsung network unlocking at android level without unlocking codes.

        First understand that your mobile identity on gsm carrier network is imei no & not you mobile no. So it is clear that locking and unlocking done on imei no. when you insert sim inside your lg mobile or Samsung, nokia mobile. Mobile immediately starts searching for available all gsm sim networks around your phone vicinity.
                   If mobile is unlocked then it can search all available gsm network and it can access all sim network. But if lg or nokia mobile is locked then it can search all gsm network but It can access only 1 sim network and when it try to access other sim network. It ask for unlock code created from imei no of your mobile. This unlock code hidden inside you android software ie kitkat or lollipop.

                Gsm sim provider network is nothing but a frequency/ band assigned to each gsm sim provider. This is called mnc / mobile network code.  Also in mobile network, every country has it own code which is called mcc/ mobile country code. Mnc and mcc is needed for generating unlocking code for lg, Samsung , nokia, Motorola.
below is the list of few mobile country code/mcc  and mobile network code / mnc.

 United Arab Emirates mcc : 424,   mnc for du company : 03.
united kingdom  mcc : 231,   mnc code for orange : 33,  mnc code for tmobile uk :30.
usa country code mcc :310,  mnc codefor verizon : 005, mnc code for at & t in usa:  660, mnc tmobile :  670.

                  When mobile is locked, this locking code block mobile to access other sim network. Like we have manual or automatic network selection option in many old Samsung , nokia , Motorola , lg mobile phone.
                Now you can understand why imei no is needed for generating mobile unlock codes. That is why it is called lg imei unlocking code and not only lg unlock code.

         There are many people claiming for unlocking codes for lg, Samsung, nokia mobiles. Mostly those codes are fake or may not be properly generated. So those code are not working.  For more precise smartphone unlocking, you need mobile imei no, sim provider network code/mnc and mobile contry code/ mcc.

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