I phone 4 16g black

Comes in box with charged and headphones

The phone hase been restored to factory settings and is on the o2 network

Phone is in good working order £180 posted

If you got the phone on an O2 contract then they will be able to unlock it for you which will improve your chance of selling it.

Just give them a call or go to their website and use the webchat. They just need the IMEI number.