iphone 3 gs 8g o2 network, ?

iphone 3 gs 8g o2 network, phone is unmarked on outside but could do with new ear peace speaker as little muffled! (cost £2.50 on ebay and about 25mins to fit) cant stress enough how clean and unmarked this phone is. still on iso 5 so has new owner can decide to upgrade for free or not.