Swith on Phone dial *###. Now u get factory mode. Here last option is type of sensor,select this,here two options,here select last one start G. 100% working....
SIGMATEL - S4
BRAND NEW DUAL SIM MOBILE BOTH SIM WORKS AT A TIME
FIRST SEE THE IMAGECLICK THE MENU BUTTON ON TOUCH SCREEN AFTER GO TO PROFILES CHANGE PROFILEFLIGHT MODE TO GENERAL MODE THEN UR PROBLEM SOLVED.