There are nine things that I find frustrating about my iPhone. In no particular order, here they are:
1. Only one application can run at a time. When the Google application bounces me over to Safari, it closes. When I return to it, I have to start all over again, rather than being able to just refine the previous search.
2. No copy and paste. If I have to go back and start from scratch, at least let me copy my previous search and paste it back in.
3. Battery life. I know that this is just a fact of life that I (and every other iPhone owner) will have to accept and deal with. Still, it's very frustrating -- when I text someone, I can almost see the battery gauge decrease.
4. The Apple applications that actually control core features -- the phone, SMS, and camera -- apparently can't be replaced, even if some indie developer were to cook up something better using the iPhone SDK. Though these apps are usable, they lack features that I previously had on my three-year-old el cheapo Siemens handset.