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Custom HTML doesn't currently work with Mobile Publishing, so custom-coded elements won't be displayed on Mobile Publishing anyway. If you have e.g. Picture or Text Widgets which you want to hide on your Mobile version, you could add them to HTML Widgets, and then they won't be displayed with Mobile Publishing.
I'm afraid that it's not possible to hide particular pages from Mobile Publishing. I'm sorry that I don't have better news for you at this stage.