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Often people talk about restarting an iPhone in the same way you restart a computer.

How do you do this, what buttons do you press?

Also how/why is this different to just turning off the iPhone using top button and then turning it back on?

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I do not see the point of restarting the iPhone regularly. In my expereince it works normally and it is not slowing down or anything. The top button is putting the device in sleep mode. –  gyurisc Jul 15 '10 at 4:42
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3 Answers

You can restart the iPhone by holding the power button and home button for about 5 seconds (until you see the apple logo pop onto the screen). You may have to do this if the phone freezes, or otherwise becomes unresponsive. http://www.apple.com/support/iphone/assistant/phone/#section_2

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To perform a "hard" reset, you keep holding the Home and Sleep/Wake buttons until it reboots itself. You do not slide the red power off toggle switch –  Michael Kniskern Jul 14 '10 at 23:46
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Holding down the power and home button for about 5 seconds will perform a hard reset. Restarting your iDevice frees up used RAM. Low RAM is the main reason apps crash, which is why it's suggested to restart your iDevice every once in a while.

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Pressing the top ("Lock") button locks the phone and turns off the display. That is useful for saving power and for security.

Turning the phone off can be accomplished by holding down the Lock button until the red arrow button displays saying "slide to power off". Turning off the phone in this manner will allow any running processes / services to shut down gracefully. This is akin to shutting down your Mac. Shutting down your iOS device every few days will free up leaked memory and may help it to work better or faster. I shut my phone off nearly every night, then plug it into the wall charger which turns it back on automatically.

Holding down the power and home buttons until the device restarts itself is called a "hard reset" and is akin to pressing and holding the power button on a Mac. Restarting in this manner does not give running processes a chance to shut down gracefully and may in fact result in lost data. This technique should be a last resort, not a daily practice because of its potential ill effects.

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this is spot on. holding home/sleep wake is like yanking the power cord out of a running computer - last ditch effort. far better to power cycle the normal way, by holding the sleep button and sliding to power off. –  Gauzy Jul 28 '11 at 16:38
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