For months now, AT&T (NYSE:T) has been promising network upgrades to frustrated iPhoners. On Friday, Ma Bell made good. Wired, TechCrunch, and a handful of other outlets report that multimedia messaging -- or MMS -- is now active on the iPhone.

If this seems like a "well, duh" moment, you're right. MMS should have been available a lot sooner, especially with the iPhone's level of interactivity. YouTube support is standard for the device, for example.

You'd think both AT&T and Apple (NASDAQ:AAPL) would blush at the thought of selling a smartphone that's able to play videos, but not send them. Whether they were chagrined or not, this "issue" is no longer an issue. And that suggests AT&T is fulfilling earlier promises to spend $18 billion to add network capacity.

Ma Bell's spending spree will surprise no one. Search the Web, and you'll read the complaints about AT&T service. Or better still, spend some time at Twitter, the billion-dollar-microblogger that hosted more whining than the set of [Name Your Favorite Reality TV Show Here].

Service issues -- including dropped calls and missing voicemail -- may explain why rumors persist that Apple is talking with Verizon (NYSE:VZ), and why Apple refused to be boxed into exclusive carrier deals with China Unicom (NYSE:CHU) in China, and KT (NYSE:KTC) in South Korea. Why be married to a network that's not ready for the commitment? AT&T certainly wasn't.

Now, with MMS support, that's begun to change. Finally.

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Fool contributor Tim Beyers had stock and options positions in Apple at the time of publication. Check out Tim's portfolio holdings and Foolish writings, or connect with him on Twitter as @milehighfool. The Motley Fool is also on Twitter as @TheMotleyFool. The Fool's disclosure policy sees this story splitting the uprights. Disagree? Leave a comment in the box below.