Bloody mobile phone companies!

I'm in the hunt for a new phone. The new-ish Sony Ericsson K800i looks quite nice and with the built in camera, is just the thing I'm looking for. However, if I want to upgrade to it, I'm being told I have to pay £140. Fuck that for a game of soldiers. On an additional note, to"upgrade" to my current phone, I'd have to pay £80! That's just taking the mickey completely. *growl*