Companion App. On Windows Phone. Make it so.
Edit: I actually have an iPhone and use the companion app. I just feel like advocating for WP too.
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Here you go. [url=http://www.windowsphone.com/en-us/store/app/tower-ghost-for-destiny/dcdc5501-55e3-477b-a953-302f38da02ae]Tower Ghost for Destiny[/url]