Android smartphone sim unlocking details


Android smartphone sim unlock codes & requirement for generating android smartphone sim unlock codes




                        Sim locking is combined effort of gsm sim provider and mobile company like nokia lg samsung. Sim locking is widely used by mobile phone seller for their business purpose.  Many time new smartphone technology are launched. And to attract customer mobile are sold at lower price than its actual price. And to recover cost and to make profit such mobile are sold with locked sim. So that customer stick to company for longer period of time.  Mobile pop up msg like network locked simcard inserted, sim restricted or sim card not accepted or invalid microchips are the example of mobile sim locking.

                               Briefly sim locking is the process by which it locks your android mobile to that particular sim provider’s sim and network of that sim gsm service provider. Now if you want to use another sim then either you need to unlock your sim or unlock your android phone.

                                  Technically when you insert sim first to your android smartphone it finds sim and search for network available. At that time sim fix network of sim’s gsm provider on your mobile and generate one code. This code requires when you want to use another sim or network on that mobile. This code is knows as sim unlock code.

                           In other word Sim locking means you cannot access any other network other than that locked sim. If you want to use other network than you need to get unlock codes for your smartphone mobile. For that you need to generate unlock code for your mobile simcard from imei no.

                        Let me brief you in gsm mobile, network information are stored within sim card and locked with sim card. While in cdma mobile network information is programmed with codes and these codes are integrated with your cdma mobile software. My page mainly focus on gsm mobile.
                             Now a day’s sim are smaller size and this sim don’t have backward compatibility. Older sim can be used with new android smartphones. But for that you need to cut your sim to small size. This is applicable to fewer countries sim only.

                                 Many time when you insert sim to mobile you will get a message that enter sim unlock codes or contact service provider, this is also one kind of sim restriction error. And this happen when your phone is locked by gsm network. In this case also you need to unlock your sim to use your smartphone on other gsm network.

                       Sim locked is done at software level. Now a days smartphone are installed with latest marshmallow, lollipop and kitkat mobile os software. This block your mobile to access other gsm network and it also stop your mobile to use on other gsm network.  This os not allow master unlock code for mobile sim. Older lg, nokia, Samsung phone you may get master unlock codes for your mobile. But now it is not possible to get master unlock code as newer android os are robust  and more secured.
                   On sim gsm network android mobile is identify by imei no of your android phone and not with your sim mobile no. And locking and unlocking of android sim is based on imei no of android mobile.

For smartphone sim unlocking or to generate unlock code for your smartphone you need:

1)      Imei no of your smartphone : which is unique for each mobile. If you have dual sim mobile then you may have two different imei no for two different sim slots. This two sim slot named as master sim slot and slave sim slot.

2)       Make and model of smartphone : make is like lg, samsung, htc, motorola, nokia etc.
Lg models are lg g, lg g, lg g5, lg v10, lg k10.
Samsung models are samsung galaxy, samsung edge, samsung galaxy note etc,
Nokia lumia.

3 ) sim card serial no – there is a distinct serial no for each sim card. So to unlock sim you need this serial no also. This is not necessary much.

4 ) mnc & mcc –            mnc stand for mobile network code like tmobile, at&t, orange, us cellular each have their mobile network code. Mcc stand for mobile country code. This is a separate mobile country code for each gsm sim provider.

5) Version of android os installed on smartphone mobile - This is used to know the which android os like marshmallow, lollipop , kitkat , jellybean or sandwitch is installed and the version of that android os. Mobile and sim are locked at software level as I mentioned earlier. So to generate sim unlock codes for your smartphone it is necessary that you provider very precise information.

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