I did this and I'm on kitkat. You have to use a program called radiocom and also you have to root your phone.
This is my first day so I don't know if I can post links to that kind of information though.
Someone else posted the link I was going to post here in another thread so I'll add it here.
You really have to follow the instructions cause if you mess up you could really ruin your phone. There are some extra steps after the radio change and I have done this on my kitkat phone.
http://forum.xda-developers.com/showthread.php?t=2166542