1: Turn on phone with Not Accepted SIM card.
2: A menu will pop up to Insert the code.
3: Insert the provided code and press OK
4: Device is now unlocked.

*Not accepted sim card mean any other sim card other then your current locked to network
**Important**

Before placing order please make sure your phone has unlock attempts remaining.Which you can find by dialing *#*#7378423#*#* and then Go to Service Info > SIM lock you will see a list of lock types followed by a number of remaining attempts to enter unlock code. [x] before the lock name means it is enabled