iPhone FAQ: How do I delete/remove/uninstall iPhone apps (iPhone applications)?
When I learned how to move iPhone app icons around last night, I also learned how to remove iPhone apps that I've downloaded and installed from the App Store. Here's how you delete iPhone apps.
To delete an iPhone app (application), just press and hold one of the iPhone app icons -- it doesn't matter which one -- on screen, until all the icons appear to get nervous and start wiggling around. When this behavior starts, all of your third-party iPhone applications will show an "X" icon in the upper-left corner of their application icon, as shown in this iPhone screenshot:
As it turns out, the iPhone app icons have good reason to appear nervous, as you can now do things to them, including moving or deleting them.
At this point you can delete an iPhone app by pressing that "X" in the upper-left corner of the application icon (such as the Mobile News, Pandora, and Break iPhone apps in the figure above), and the iPhone should prompt you with some form of "Are you sure?" message.
In my case, when I started to delete an iPhone app, I was prompted that I hadn't backed up my data for that app, but it was no big deal, it was just a free app that I downloaded and installed, but didn't like.
After you've deleted the iPhone apps you want to delete, just press the iPhone "Home" button to get the apps to stop shaking.
You can also delete iPhones apps when your iPhone is connected to your computer and iTunes, but I haven't been home recently to try that. (I assume I will also see some kind of synchronization-related message related to deleting this application the next time I connect my iPhone to iTunes, but I don't expect that to be a big deal.)
Final note: It doesn't look like you can delete the iPhone apps that come pre-installed from Apple. That's probably a good thing. :)
I get a lot of comments here about iPhone apps that end up in a "waiting" state after you try to install or update them. I've gathered up all the information I can find about apps in a waiting state, and put that in one article here: How to update, install, or reinstall iPhone apps in a waiting state.