Pix2Fone is a free extension for Internet Explorer and Mozilla Firefox combined with online service. It adds Save Picture to Mobile Phone option to the browser and lets you save any photo from your computer or internet as your mobile / cell phone wallpaper. Picture resizing / cropping tool and special image enhancement mode create perfect wallpapers, backgrounds or screensavers for virtually any modern phone with color display.
Version 1.6.1 may include unspecified updates, enhancements, or bug fixes.
"Free & small"
It's a small extension that does what it says and is better than paid programs!
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Note: The review & comment are referred from CNet