AT&T has announced plans for the iPhone MMS rollout via its Facebook page. We’ve known for some time that the service would be coming on Friday, but the how and when wasn’t so clear.

From the company’s Facebook page:

MMS Update: We know you’ve been eager for this service so we wanted to offer a quick update on the launch plans for MMS on Friday, Sept. 25. Late morning, Pacific Time, on Friday, the new carrier settings update enabling MMS should be live and ready to download through iTunes. We’ll provide the steps and all of the details you need right here at that time.

For my fellow east-coasters, that means we’ll be waiting until early afternoon before plugging and unplugging our phones for updates. Some people are speculating that AT&T is nervous about the update, and rightfully so. This is the kind of update that has been anticipated for so long that it is likely to kill AT&T’s networks in a lot of places. And if the service fails on day one, the public will be calling for the bodies of AT&T executives.