although this is not the way WordPress prefers to do things. (I find this method much easier and use it all the time, since it allows caching of the style sheet without any problem.)
I also have the Graphene Mobile theme [purchased], does it work with custom fonts as well?
The second method listed above with work with Graphene Mobile Neo, or you could achieve something similar with a child theme. However, using custom fonts with the mobile version of a site can slow it down considerably (not everybody lives next to a 4G tower, after all), and if your site loads too slowly, people may not stick around for it.
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