Ics sense hd2 !

Swap iPhone 3gs + cash for iPhone 4
I have got iPhone 3gs in White on Vodafone comes with box and all accessories. Good condition, few marks on back and silent button is stuck on loud. Not a mark on the screen as I have always used a screen protector. Excellent working condition and has got latest ios installed. Wanting to swap for iPhone 4 on Vodafone or factory unlocked must be good condition and have box and accessories. Will pay extra £120 plus my phone. Please contact me if you have what im looking for. Thanks Liz