Faulty Apple iphone 4 16GB Black (Working) !

I am selling my iphone 4 as I have recently upgraded to a newer model. Although the lock/on/off button is broken it is still in excellent working condition. The button just stopped working and feels as though it is stuck in. Apparantly this is a common problem and there is a function called assistive touch which you can use instead, shown on image 3, this allows you to still lock the phone etc. If the battery dies it comes back on as soon as it is charged. The middle button is sometime tempremental so you have to sometimes push this a few times, again common problem. Phone is currently locked to 02. There is a few scratches and a slight crack on the back about a 1.5cm long near the edge hardly noticeable, i have taken a photo of the back of the phone to show but like i say you can barely see it. It comes with box, earphones, adapter charger thingy. and little booklet. No sim. Collection only so you can check the phone first as it is sold as faulty will not accept return. please feel free to ask any questions or view it Shelley