iPhone 4S 16GB - 1 WEEK OLD - BRAND NEW CONDITION. ?

I am selling my iPhone 4S as it is on the wrong network, it is locked to Orange/T-Mobile and I was under the impression I could have it unlocked but found it that will cost me £50 which I cannot afford right now. I would also prefer an iPhone 4S in white, so I would like to sell this too buy a phone on the right network. Would consider a straight swap for same phone on right network, or for a Galaxy S3, would also consider a WHITE iPhone 4 + cash. Comes with box/charger/usb/headphones/sim pin to get sim card out/apple stickers. Brand new condition with screen protectors.