iphone 3gs 16gb fully working unlocked to any sim ?

iphone 3gs black 16gb phone only factory unlocked by apple is in full working order apart from volume buttons have fell off but still can turn up and down and the power button up to as fell off too but still can use . the phone case a crack mark at back off phone but does not affect iphone what so ever . the screen is 100% perfect with no faults. so get you self a case 4 it and none would even notice lol please no time waisters and offers this phone is worth 80 and will sell 4 that . any questions please contact thanks