As we all know, this platform has a very small market penetration.
I've started to write a Windows Phone 7 version, but need some help and direction from 3CX regarding the tunneling services and codec licensing. They have not responded, so I've abandoned my development, for now.
With Windows Phone 8 not making a big splash either, I don't know if 3CX will ever want to support me with building an app.
PM me if anyone else wants a WP7 version.