Black iphone4s 16gb working .

Iphone 4s black 16gb working but 1 slight problem it can be sorted Its just you cant hear the ringtone when somebody is calling and u when u answer u can hear there voice but from a little distance If you put headphones in u can hear everythng 100% evn the ringtone It does not come with earphones as to hygine reasons Its on o2 Call for more info thanks It may also need flashing because sometime scrreen goes blank and the phone still is on cost 10 ta do And also the side button does not work when u put it on silent or loud so it might need cleaning but phones cheap enough No timewasters Sold as seen Calls only no offers please i can show it working