Over at MoDaCo there’s a very early version of some SIM unlocking software for Orange SPV C500 handsets (only!).
Coded by Zone-MR and available for application-unlocked handsets this appears to be a new, free way to get your Orange SPV C500 working on other networks.
Of course, you’ll need to know a bit about what you’re doing and it involves some fiddling about, so if you smeg up your phone then it’ll only be your fault (gawd, I sound like a nagging Aunty) :)
Link – MoDaCo.com