I'm trying to enable MMS on my iPhone, and whenever I download one of the carrier files, I get a file called ATT_US.bundle. This cannot be selected from iTunes when I option-click "Restore." If I change the file extension to .ipcc, it still cannot be opened. I downloaded another .ipcc file that worked fine, but only enabled tethering. Does anybody have any idea what I'm doing incorrectly? Sorry if this is a dumb question.