IPHONE 4 FAULTY - NO SIGNAL NO SERVICE !

FOR SALE IS AN IPHONE 4 16GB IN BLACK. THE PHONE FUNCTIONS PERFECTLY FINE. YOU JUST CANNOT MAKE/RECIEVE CALLS/TEXTS THE PHONE CONDITION IS AVERAGE I HAVE FOUR OF THESE HANDSETS. ALL ARE IN AVERAGE/GOOD CONDITION. CALL ON 07515903372....