BRAND NEW 16GB WHITE IPHONE 4S,STILL IN BOX.UNWANTED UPGRADE FROM ORANGE ?

I AM SELLING AN IPHONE 4S 16GB WHITE STILL IN BOX,UNOPENED.IT IS AN UNWANTED UPGRADE FROM ORANGE SO UNSURE IF IT IS UNLOCKED TO ANY SIM NETWORK OR CAN JUST BE UNLOCKED AT PHONE SHOPS FOR 15 OR SO.THIS PHONE COSTS 500 FROM THE APPLE SHOP SO GRAB A BARGAIN! I WILL ONLY SELL TO SOMEONE WHO WANTS TO COME AND COLLECT ITEM AND PAY CASH,AS HAVE RECENTLY BEEN CONNED OVER HERE WHEN SELLING SOMETHING ON HERE&POSTING THE ITEM. PLEASE MESSAGE ME WITH ANY QUESTIONS