| The simplest and easiest way to unlock mobile | | | | verification number is stored in an in-built |
| is to put the unlock code there and unlock | | | | database of the phone. The second method is |
| it. Usually the mobile is locked with the | | | | verification through obscure mathematical |
| SIM, that is, the SIM installed has | | | | formula. In this method, the code provided |
| restricted usage. This is a normal situation | | | | undergoes a mathematical calculation |
| that a locked mobile phone will always ask | | | | following an obscure method provided by the |
| for its' unlock code. It appears on the | | | | provider. |
| screen of the mobile. | | | | |
| | | | Available Security Measures |
| Procedure | | | | |
| | | | Previously there was the possibility to crack |
| Depending on the manufacturer types, the lock | | | | the algorithm generated using reverse |
| is available in different format, hence is | | | | engineering process. These unlocking |
| the unlocking procedure. For example, if we | | | | methodologies were available even without any |
| use mobile phone like T610 from Sony | | | | cost involved at the customer's ends. |
| Ericsson, we may receive a warning message | | | | However, current robust and complex algorithm |
| saying, "Insert correct SIM card", in the | | | | leaves a minimum possibility to do the same |
| case of wrong SIM card. However, once the | | | | thing, which also ensures its |
| proper unlocking code is entered, the display | | | | non-availability using any free mode of |
| message will be turned into "Network | | | | operation. |
| Unlocked". On the other hand, mobile phones | | | | |
| manufactured by AT&T explain that status of | | | | A more cautious effort is made when providers |
| the mobile phone if it is locked. | | | | use a random number that can only be retained |
| | | | by the provider who applied the lock. |
| Verification of Code | | | | However, this method is not always flawless |
| | | | as it can be cracked by using special test |
| The code is essential for removing all SIM | | | | equipments. |
| locks from a particular mobile phone. It is | | | | |
| known as master code. Sometimes it is also | | | | In most of the cases, the phone are made |
| referred to as network code key. | | | | secure by using built-in software which |
| | | | restricts to enter the unlock code for many |
| There are primarily two methods for verifying | | | | times, commonly not more than 4 times. After |
| the unlock code once inserted by the user. | | | | that, the phone gets hard-locked which needs |
| One is verification through directly | | | | a special equipment provided by the provider |
| accessing database. In this method, the phone | | | | itself to unlock it once again. |
| itself verifies the unlock code and the | | | | |