Htc Sensation Xe swap for Iphone 4 or sell .

Excellent condition Htc Sensation Xe on 3 network but can be unlocked for £10 at most phone shops. Comes fully Boxed with Instructions, Charger, Usb cable, 8gb memory card and the phone. Bought for £400 4 months ago from the 3 store on pay as you go. Would like to swap for a good condition Iphone 4 plus i will give an extra £25. Or sell for £165