iPhone 4 on 3 network or swap - Quick sale! ?

iphone 4 for sale locked to 3 network this also comes with a extra back as can see in the pictures, original back is still on the phone **will accept a swap for another iphone 4 any gb and any colour aslong as its on vodafone or unlocked** only selling as i need a vodafone or unlocked phone to work with my sim in good condition 270 ONO UK buyers only cash on collection from the stourbridge/dudley area! this is a urgent sale as i need it sold due to not having a phone!