I recommend you don't, but if you must here's a thread discussing how to port roms from the international s4: http://xdaforums.com/showthread.php?t=2349440first im sorry for my pool English
i tried to replace L720(on 4.4.2 stock rom) phone app with I9500 phone app(from i9500 4.4.2 stock rom) yesterday.
but it didnt work. there is no signal after reboot.
is there a way to get it work?