Two handsets that are very powerful are the Samsung Galaxy S4 and the S3 and there are many people who have clung onto the devices. Many bought locked handsets and if they want to unlock them they generally have to pay so that they can take them to a different carrier for a better deal. Now there is a leaked unlock code that is going around.
The leaked unlock code allows you to break free the Samsung Galaxy S4 and S3 so that the device can be taken to a different carrier.
To unlock the handset you have to put a new SIM card into the tray and then turn the device back on. You should then go to the dial pad and you can type in the leaked code, which is *#197328640#. Once you have done this you can then check out the steps that are outlined below.
 UMTS >  Debug Screen >  Phone Control >  Network Lock > Options  Perso SHA256 OFF.
You then have to wait for 30 seconds and you can then go back to the main menu and you will Network Unlock. You should then choose  NW Lock NV Data INITIALLIZ and you should now have an unlocked handset. The leaked unlock code is said to work for the Samsung Galaxy Note 2, Note 3 and other devices from Samsung.