For weeks, I was having this error saying my credit card was incorrect when indeed it was not.

The solution was to erase everything from you pre, remove all patches and preware. Doctor your pre and try it again it worked like a charm for me.

I have a German Pre running in the U.S.A and I just finished buying apps, on the other hand Palm tech support told me its "Impossible" to buy apps in the U.S.A several times.

I figured this might help out our community.