Question prefered nextwork type in cm11

I have CM 11 latest nightly installed. I noticed in mobile networks->preferred network type is 2G and 3G, no 4G. what happened? Do all CM rom have same problem? I followed http://forum.xda-developers.com/show....php?t=2707029. I tried to select one from drop down menu, but it always goes back to 'WCDMA prefered'.


how to solve this ?