Iphone 4, 16gb, excellent condition UNLOCKED ?

Iphone 4 16gb. Black Excellent condition. It was replaced by Apple in December so phone is only 6 months old although because it is a replacement it is not under warranty. Was bought as a pay as you go phone so not locked to any network. The phone is in excellent condition and has always had a cover so there are no scratches on the back either. Comes boxed with all paperwork, sim tool, USB charger and plug. No headphones due to health and safety. Only selling as I now have an Iphone 4s