I'm not sure where you're looking, but I wouldn't generally recommend getting firmware updates from anywhere other than your carrier or the web site of the device manufacturer (which may not even exist in this case). Since you didn't specify your carrier, I couldn't find many specifics when I researched your question.
-------------------- Chief iPod Correspondent
Senior Time Waster
Extreme Moderator
Moderate Extremist
Captain of the Planet Express
Assistant Jedi Librarian
--------------------