First, install Font Awesome:

1. Download the latest Font Awesome version
2. Double-click fontawesome-webfont.ttf and install it on your laptop/desktop (optional)
3. Copy fontawesome.css to www/css
4. Remove the references to font files in fontawesome.css, i.e. remove @font-face declaration

Then in Xcode:

1. Copy fontawesome-webfont.ttf into "Your Project/Resources/fonts/fontawesome-webfont.ttf"
2. Add Font Awesome to the .plist file by selecting the "Info" tab
3. Add a new property named "Fonts provided by application" and set the value to "fontawesome-webfont.ttf"

Clean and build your project. Font Awesome is now ready to be used.

Phonegap example:

<i class="fa fa-cog"/>