I have tried to fiddle with the settings but for some reason I cannot disable any of the call forwarding settings, some sort of error message crops up. I have phoned up the 3 network who I am with three times today and they asked me to enter a few # codes to sort the problem out, but I had no luck, and then they had me factory reset the phone using the option in the settings. I did that, and I still have this problem. I also get the message "Connection problem or invalid MMI" when entering most # codes, this seems to have happened after rooting, though I am not 100% sure if that is the case.
My phone is the Samsung Galaxy S II I900, just to confirm that.
I look forward to hearing from you guys