Do that and then you'll need to do a full restore. Eventually a yellow triangle will pop up commanding you to connect the iPhone to iTunes. To do it, hold down both the sleep/wake button and the home button for a long time - around 30 seconds or so. Note that you're going to want to have your computer on hand when you do this option, as you will not only lose all of your data right away, but you will also be unable to use your iPhone at all until you've connected it to your computer. It's very rare, but sometimes you'll just need to start from scratch. 'Reset All Content and Settings' will delete all of your data (but not the Installer.app!), so you'll have to resync it over if you use that option.

Start with 'Reset All Settings,' which will do what it says but not actually delete anything.

Head on into your iPhone's Settings, choose General, then choose Reset. If your iPhone is still acting buggy, there's still one last step you can try before resorting to a full restore. To do that, hold down both the sleep/wake button and the home button until the apple logo appears. If holding down the sleep/wake button doesn't work, you can also try to just force a reset of your iPhone. Hold the sleep/wake button down again to turn it back on. Slide your finger across it and your iPhone will shut down. Just hold down the sleep/wake button until a red slider appears on your screen. This is the easiest way to reset the iPhone (and the safest). Just keep holding it until you're back at the home screen. This is especially useful in Safari and Mail (the buggiest of the iPhones apps in my experience). Hold it down when you're in a frozen application to force-quit that application.

You know you can hit the home button to return to your home screen, but your home button has another function. Here they are in escalating order - which is to say you should try #1 before #2, #2 before #3, and so on. Like most smartphones, the iPhone has a few curious button combinations you will want to have in your bag of tricks in case anything ever goes wrong.

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