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I think its a Yahoo issue. I had the same problem for a few weeks back in 2010 when I first got an iPhone that was linked to some kinda Yahoo server problem. It worked itself out after a few weeks. Really isn't that big of a deal, because lets face it, if you can't press the "Mail" icon every so...
The warehouse I work in has a few low signal areas and it seems if I spend a few hours in these areas, I lose the ability to use data even though "3G" is showing on the status bar. It doesn't happen all the time but like the above poster stated, all I have to do is switch into "Airplane" mode...
That's a flaw of the iPhone mms. It's that way on AT&T too. Very annoying and I hope they fix it someday. But figuring that it took Apple 2 years even allow mms, I wouldn't count on a quick fix!