hello ! after a week of testing ive finally found a solution for samsung galaxy s4 clone ( mt6572 gt-i9500 ). with no service !
Soo , you have no service and can't make calls ! follow this instructions and you will be talking on your phone in...
try my tutorial here and i hope it work's for you guys... is true, this is for no service phones , but its a modified rom soo may also work for dead phones ;)