This is a tutorial for unlocking a range of Samsung phones, I really don’t know which phones, but if you will try it, comment if  it worked on your phone.

Let’s start.The process is really simple: The first step to be done for decoding is to remove the SIM card and restart the phone without the SIM in it. Step two is to insert the following code * 2767 * 3855 # after entering the code  it will appear next message FULL E2P RESET. After the message disappears from the display, you will enter a second code * 2767 * 2878 #, then it will appear another message, saying E2P CUSTOM RESET. Once this message disappears, you must introduce the last code # *7337 # and then the long anticipated message will appear: UNLOCK.
Warning! Codes must be entered only in the order I gave. The method is personally tested on several models of Samsung phones.