Of course these are isolated data points. I do think that Apple has made a mistake by limiting the iPhone to one carrier, especially one that can arouse strong hatred like AT&T.
I don't know if it's the phone or the network - I haven't done much testing. It's quite irritating pressing the answer button repeatedly and the phone not answering the call, or when I call someone and I end up unable to hear them while they can hear me.
OK, I'll give you MMS.
Disclaimer: The closest I own to a smart phone is one of these email/phone/web devices they sell in Japan that has a pita interface to use.
(Keep in mind: Playing music and txting / getting phone calls is multi-tasking.)
Who else sells a computer with only one mouse button? Who else sells a phone with only one button? No copy/paste? Awful APIs that prevent you from really reading camera data? First iPod had less disk space than any other player First iPod had no windows support Safari's extension support are crappy relative to FF or even IE OSX dock can display 1/100th the apps of menus on other OSes
Apple's strategy is to cut features. This is roughly equivalent to asceticism: finding enlightenment by doing less. Like asceticism, this seems a bad idea on the surface, but some people really seem happier doing it.
Tho' this is becoming less important because people on all platforms just post to Facebook or Flickr directly from their phones now, but even so, lack of MMS hurt iPhone early on.
(I'm in Europe, not everyone has MMS).
You get a text message that says to go to viewmymessage.com with some ridiculous username & password pairing. Since you can't copy & paste, or multi-task, you have to somehow remember what that combination is. Of course, once you've managed to pull up the page, you find out that the multi-media part of the message is a SWF... Which the iPhone doesn't support.
The iPhone, with rare exception, obeys the UI convention that leaving an app closes the app rather than leaving it running in the background. The exceptions to that (Phone and iPod) indicate at the top of the screen that they're still running in the background. OK, so third party apps could have that too. But once you start adding taskbars and process monitors to the phone, you still lose something.