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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