iPhone 4s White 16GB ?

I have a white iphone 4s 16gb which i think is locked onto 3 network as i have never tried another sim card in it. Phone comes fully boxed with earphones, charger, usb lead, and manuals and pin. Phone is in new and perfect condition, as i have only had it for 1 month but i dont like it. Price is £400 OVNO so no silly offer as the phone alone from the apple shop is worth £499. WILL NOT POST OUT SO SCAMMERS DONT WASTE YOUR TIME. EMAIL OR TEXT PLEASE.