Your Apple iPhone serves many functions -- an iPod, game console and Internet provider, among others. All of these activities drain the battery on your device, which you normally charge via an electrical outlet with a power adapter. However, you can also charge your iPhone using your computer, including your laptop, as all iPhones come with a cable designed for computer charging. IPhones are also compatible with the cable that comes with classic and touch iPod devices.
Turn on your laptop and make sure that it is fully charged. If necessary, plug your laptop into a wall outlet; charging your iPhone takes a toll on your laptop's battery.
Attach the long end of the dock connector to USB cable into the bottom of your iPhone.
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Plug the shorter end of the cable into a USB outlet on your laptop. Your iPhone automatically begins charging.
Monitor the status of your iPhone charge by pressing the home button on the phone. A battery icon on the screen shows the progress -- once the icon is completely green, your phone is fully charged.