Ok, so here's quick tutorial.
This is code: http://pastebin.com/XN8WAaS6

Open Messenger app, go to Profile and somewhere on the bottom should be 'Internal' option. Enter it and scroll to 'Gatekeeper Override'. Click on it as well. After that just search gatekeepers and switch them as you like (here are all possible http://pastebin.com/42YuuYhx ). Restart messenger and done :D