For a iOS phone icon make a .png 180x180 name it apple-touch-icon.png and attach it to the root folder with your favicon.ico image. Then put this in the HEAD below your favicon links.
I use this for example:
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
<link rel="apple-touch-icon" href="apple-touch-icon.png">
By the way this is a great tool for converting images to the .ico format
http://tools.dynamicdrive.com/favicon/