samsung galaxy s2 unlocked £230 or swap for iPhone 4 ?

I am selling my samsung galaxy s2 in black 16gb comes with box and all accessories also i will throw in a 8gb memorycard the phone is in really good condition and unlocked to all networks. i will aslo put in a hard case WOULD BE WILLING TO SWAP FOR IPHONE 4 if interested please ring me on 07599627628 thanks marie