Don't get me wrong, it's awesome and I couldn't live without it, but I gotta complain about something...
OS 3.0 Lag
All apps seem to take much longer to load/unload after the OS 3.0 update. Laaaaaaaag.
To be honest, I don't mind this so much anymore given the iPhone's spectacular display and powerful applications. You can't have your cake and eat it, too, right?
Or the complete lack thereof. Give me a way to categorize my apps, please. Having to type in the app name via Spotlight or scrolling through every single screen isn't efficient.
Also, how about something like a "bin" to temporarily place all my apps that are on the back burner? I don't necessarily want to delete them, but they don't need to be cluttering up screens.
Accessing the Keypad During Call
I'm of the opinion that the keypad AND the other options can all be visible on one screen. The lack of physical feedback is bad enough--why would the designers also want to hide the keypad and force me to manage states while I'm on a call? There's plenty of space available!
The speakerphone volume is too low. Why can't it blare loudly just like when I'm playing songs with the iPod app? And NO, I'm NOT using speakerphone in public...
Shutter Release Button
Trying to take a one-handed photo is tough on the iPhone. You have to balance the device while trying to depress the shutter release button. Couldn't the designers just overlay the button on the top-right or top-left side of the camera (depending on whether you're left-handed or right-handed) where your thumb would naturally rest instead of the 90 degree angle required at the bottom?
Note: The shutter takes way too long... lag.
It must be some conspiracy by the Japanese technorati to keep emoji out of foreign hands. Because obviously those outside of Japan could never harness the awesome power that comes with using cute, expressive emoticons... WTF Apple?
It's a neat little search, but I don't use it all that much... Does it really need to be it's own home screen? Just make it an app (or at least have the option for this). I hate over-swiping the app pages and ending up on Spotlight. It forces me to have to back up (and it lags so I gotta wait a second or two before it actually swipes back to the home page).