This is Voodoo Galaxy S III SIM Unlock application,available on Google Play: https://play.google.com/store/apps/details?id=org.projectvoodoo.simunlock What you have here is open source code, published under my favourite WTFPL license: http://sam.zoy.org/wtfpl/ Guess what it means... Please change the strings and names if you want to publish a clone of the app, You could be even nicer by contributing to this one directly ;) Also if you find bugs in the source code, especially critical & security ones please contact me as soon as possible. Original source code location: https://github.com/project-voodoo/galaxysiii-sim-unlock-app Author: Simond François aka supercurio http://twitter.com/#!/supercurio Unlocking method by txlibre: http://forum.xda-developers.com/showthread.php?t=1715149 Adapted from this original work from many contributors: http://forum.xda-developers.com/showthread.php?t=761045 TODO: Current version has one known issue (not a big one) which is the secret code *#7465625# popping up system "Personalization Status" tool only at second attempt. One missing feature is backup restoration and re-locking. Thing is restoring from a backup stored on sdcard is unsafe by design, because this backup could be altered by mistake or malicious tools. Also, if something went wrong it might be a good idea to restore backups manually after careful analyss, as you know, things are not not supposed to go wrong with this app^^ Re-locking however is a trivial operation and shall be implemented if it's a common feature request. Of course you might have noticed that the app is ugly as hell. This is kind of intended as people notice immediately it's a hacker tool instead of a commercial polished solution they'll complain about to the author, but if you feel like contributing with a beautiful yet simple UI.. why not!