[HELP]Location of default.xml on Kyocera Brigadier?

Hey there,

I was trying to get rid of the "unknown sim card" notification on my Kyocera Brigadier. I got it running on AT&T, and it works great, I just constantly have that notification saying it's an unknown sim card, which is kind of annoying. I found with other phones there is a default.xml file located in the system/customize/acc folder, that can be edited to get rid of this error. The problem is, on the Brigadier I don't have a customize folder in the system folder. And the explorer (droid explorer) i'm using doesn't have a search function.

Another question is, if the phone doesn't have this file at all, if I created a customize/acc folder and placed a default.xml file in there, configured so that the sim card wouldn't be unknown, would the phone read and recognize this?

Edit: I downloaded ES Explorer and searched for default.xml, nothing turned up. So I guess the question now is, is there another file that does the same thing as default.xml, or if not, could I create me own default.xml file and have it read by the system?

Thanks in advance!