Locked C100, what to do?

[The Coolest]

Hey people,
I recently bought a C100 from someone in the UK. I live in Israel, this phone is locked to Orange UK, so I thought that it should work with Orange Israel, well... It doesn't. (I got the phone without a SIM Card) When I put in my card it says "Wrong Card", does that mean that it is just locked or that I will not be able to use it on my network even if I unlock it? I just read in another thread that an A300 displays the message of enter an unlocking code?
I also bought a C100 USB cable, should I be able to unlock it with that cable?
Also I can query the modem (the phone) when its connected, but any phone managing software can't see the phone. Only EasyGPRS sees it for a second and then goes offline. What can I do?

Thanks in advance for any help.