That would take a lot. AFAIK, Windows Phone does not support secure elements in its code at all. That would have to be supported first. Then the software for it would have to be written from scratch.
I'm also not sure if the current market would support that idea, because of the share of WP vs. Android.
Don't get me wrong, I would love to see it, I'm just saying it would take a ton of work from Redmond to make it happen.
(Note: I do work for AT&T, but my statements are my own.)
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