The Lifesize app is not currently available for Windows Phones.
Recently we made the decision to go with Windows Phones and Surface Pro combinations for our remote users.
The upside to making this move has been more productivity from Office applications.
Unfortunately the downside moving away from the iPhone\iPad combination is a number of key applications are not available for Windows Phones.
When we asked the question, when will Lifesize become available for Windows Phones this is currently under review and is subject to the number of users taking up Windows Phones.
If it were to be released would you use it?