Black iPhone 4 16gb (damaged) .

Im selling a black iphone 4 16gb locked to o2. Broken back and cant hear anyone on the other end of a phone call. Youtube, videos, music and everything else works perfectly tho! I think this is fixable but i havent had the time to go get it repaired. Unfortunatly i can not offer a refund as its a buy as u see item. Any questions just email me. Many thanks.