Most modern cell phones allow you to customize their look with wallpapers. These wallpapers are typically small images in JPG format. Phones typically come with several default wallpapers, but many users prefer to change their wallpaper to an image of their own creation.
Resources 
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- Hellaphone Cell Phone Wallpaper Maker -- a free online tool that will make a wallpaper for you phone out of any image, and can even send it directly to your phone
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