Looking to swap my Iphone 3g on 02? !

I have decided Id like a change and would ike to swap my Iphone 3g. Preferably with a blackberry but will consider something else which is along the same lines. Im in waterlooville, hampshire. Willing to travel a little bit if need be for the right phone. The iphone is on 02 and reasonable condition. Comes with charger. Please email me