Ok, so as I've noted before (several times), the iPhone isn't perfect, or anywhere close to it; but it is pretty damn good, even great sometimes.
The biggest irritation with it is the lack of cut and paste. That still irks me constantly; but it doesn't really cause problems for me.
The SECOND biggest irritation I have with the iPhone DOES cause me problems, and it's this:
That's the mute switch, and it's ENTIRELY too easy to accidentally flick on. In fact it will do it all by itself when jostled etc...
Worse, the lock function doesn't prevent the mute from being engaged. There is no way to stop this from happening.
I can't tell you how many calls I've missed because of this. Dozens certainly.