Some people are reporting they are getting a text message from AT&T prompting them to update their firmware on their iPhone. "An important software update for iPhone 3G has been available on iTunes since this past Monday," the message reads. "To get it, simply sync your iPhone 3G with iTunes and click the ‘Check for Update’ button."  It seems strange that AT&T would want the update.  Maybe they are concerned about data usage or maybe they are afraid of jailbroken iPhones. Regardless,  you should update anyway. [Read]