No Donsun... don't put yourself down because you are actually on the cutting edge of technology... Your Sprint Pocket PC uses Windows, doesn't it? You probably had the Microsoft software adjust itself automatically...
... hey, I've had it happen in desktops, so I imagine it can happen to a PPC, too.
The security settings you want to change are in your browser, probably Internet Explorer. on my MDA I was unable to find the security settings menu... it might be picking it up from my desktop settings...
Maybe your best bet is to go to the vendor who sold you the phone for help, or call the Sprint technical support... I know TMobile has been helpful for me...
Good luck, and please let me know what happens!
Manny