you are going to want to try another custom firmware, whoever had that one is probably using their phone with an unauthorized carrier (I know 02 is an official carrier) and if that be the case probably had it set up "hacktivated" because it will not activate via itunes. This will render a phone using an official carrier useless until it is reflashed with a different custom firmware.
Check for a different firmware or keep waiting for the windows jailbreak. Sorry I couldn't be more help