Hi, the only way to reset your phone is to get it unlock by phone software,actully, its to remove all service provider lock and to clear all user code. There are no master code that overrides your code unlike nokia phones. Site like da vinci team could reset your phone code, but you have to pay, you may be able to find software to reset your phone, but you will need a special cable, "fighter cable" are the easiest to use. I could unlock/reset your phone for free, but you will have to pay for the postages.
well, try ebay. you can get the cable for about £13, if you are willing to pay for a little more, ie, £2-3, you can also get the software off the ebayer.
This address will take you to a Online Master Code Calculator. I tested it and it works. http://nfader.z-host.ru/ Just type this code instead of your security code.