IPHONE 4 IN BLACK 8GB IN EXCELLENT CONDITION WAS ON VODAFONE MAY BE UNLOCKED ?

IPHONE 4 IN BLACK 8GB COMES BOXED WITH INSTRUCTIONS CHARGER AND EARPHONES ONLY 7 MONTHS OLD IN GREAT CONDITION WELL LOOKED AFTER NO DENTS OR SCRATCHES ON SCREEN BODY ALSO IMMACULATE AS BEEN HOUSED AND HAD COVER ON SCREEN HAS BEEN USED WITH VODAFONE UNSURE IF THIS IS LOCKED AS NEVER HAD ANOTHER NETWORK SIM TO TRY IT IN FULLY WORKING PHONE IS IN GREAT CONDITION ANY MARKS IN PICTURE ARE FROM LIGHT RELECTING ONTO THE CASING AS IS SHINEY