Gain root access (can't hold your hand just show you the way, figure it out..), install root toolbox free and edit build.prop settings, search for ro.build.target_operator= and it will say ro.build.target_operator = SPR , change SPR to OPEN, reboot and open Root Toolbox again to edit build.prop then change OPEN in target_operator to lowercase spr so that is ro.build.target_operator=spr and VOILA unlocked for gsm with NO system UI crashes. If you just change SPR to OPEN and save it and leave it then you will get many crashes. To enable data add carrier's apn (option is usually disabled) so the workaround being install tweakker from the play store (free) and follow steps to get apn working for data and use app 'Network' from PlayStore to change network modes as the options are disabled by default because of Sprint Nazis.. YOU ALL ARE WELCOME!! Knowledge is Power!! -Sha0ggy