AT&T has confirmed that MMS will be coming to the iPhone 3G and 3GS on September 25.

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.

There’s still no word on tethering but the announcement goes on to talk about the massive increase in data usage on AT&T’s network since the launch of the iPhone (350% year-over-year). With how long it took AT&T to “prepare” for MMS, they don’t make me feel like tethering is coming any time soon.

Previously:
7/11/09: Appmodo Still Claims $55 as Tethering Price
6/25/09: Enable Tethering and MMS Using MobileSafari
6/18/09: MMS Coming to iPhone in July, Tethering Will Cost $55

Update 9/6/09: YouTube – AT&T Network 101 & MMS Availability Update

Update 9/9/09: In another attempt to improve their network, AT&T has announced their rollout plans for 7.2Mbps 3G service.

Update 9/13/09: There have been several reports (MobileCrunch, HowardForums, and Mediaite) that AT&T has already began rolling out MMS to some iPhone users. For what it’s worth, I don’t have it yet and haven’t spoken with anyone who has.

Update 9/23/09: From AT&T’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.

Update 10/16/09: iPhone Tethering May be a 2010 Thing

Update 11/14/09: AT&T on iPhone Tethering and Verizon Ads