I have a window phone as well, was a little annoyed seeing they only offer it for iphone, and no word that they will be even looking in to make others. I personally don't want to have to spend the money on a physical key, when I should be able to do it with my phone. Would be great to hear about this, and whether or not it is something they will work on. Knowing my lucky if I buy the key, they will announce that the windows phone authentication app will be released at the end of the week. Lets hope they do this for us!