I accidently got roped into that pincode with FoxFi.... but a friend of mine installed FoxFi last week on AT&T and it asked him to install PDAnet and he was never asked to supply a pincode.
I am here to tell you, that once you set a pincode, there is no way to remove it and go back to Pattern Swipe to unlock your phone. At least on my Verizon phone there isn't.
I had to Factory Reset my phone and reinstall all of the apps.
but, now that I have Kies 3.0 installed, that is not hard at all....
Reset..... start up Kies, reinstall all the apps, done....
Screens, homepages, everything back to normal.
If you get stuck with the pin code issue... go into your phones settings/security/clear all certificates. I don't know if someone posted a response to this but that's how I remove it. I cant promise it wont mess up anything else on your phone. It does not mess up anything on mine. Good luck.