iPHONE 4s WANTED!! need it on 3 network -

iPHONE 4s WANTED!! need it on 3 network, Would pay £320 for iphone 4s 16 gigs. Would pay £400 for iphone 4s 32 gigs. would pay £480 for iphone 4s 64 gigs, must be sealed...cash waiting, just want one phone... must be on 3 network.