I have a used iPhone 3GS 16gb black for sale
The phone is in good condition and comes with charger but older 8gb box. Also has tool to pop the SIM card holder out.
The silent switch on the side does not work but other than that is in excellent working order.
The iOS is up to date and gives full functionality similar to newer models.
The back has marks on it where dust was trapped behind a case. A cover is a must for these phones anyway just incase it gets dropped etc.
The phone has been unlocked by O2 officially.
Please contact me if you need more details.