You need to install a "registry editor" on your mobile device, similar to that found in Windows XP. If you are not familiar or have little experience with editing the Windows Registry, I suggest you have someone who is experienced do the mod for you. The process is rather simple, but if you change or delete the wrong thing, you can mess up the registry rendering your phone inoperable.
However, if you wish to try it, the one I use is a licensed copy called "Simple RegEdit". It cost $7.95 at the Handango web site.
http://handango.com Type
simple regedit in the search box and following the instructions for purchase.
You can probably find a shareware freebie out here, but I just purchased mine.