Hello
we will soon release 1.4, with the following tickets closed: adding support for windows phone 7 version 7.5 by thirashima · Pull Request #1 · matomo-org/matomo · GitHub
Download the ZIP: http://builds.piwik.org/piwik-1.4-rc5.zip
Please, if you could upgrade and test it would be great. It should work very nicely since a few users already run it, and we have made lots of tests and not introduced too many changes.
Thank you!