AT&T today released more information about the upcoming MMS service for iPhone 3G and 3GS customers. AT&T said in the press release:
We know many of our iPhone customers are eager for an update on our rollout schedule for Multimedia Messaging Service (MMS). We’ve been working for the past several months to prepare our systems and network to ensure the best possible experience with MMS when it launches – and that launch date is: September 25 for iPhone 3G and 3GS customers. MMS will be enabled through a software update on that day.