Isn't it possible to talk to Windows' owners and ask them to develop WinPhone further? 
But... We did not call them. Windows Phone is their product. They decide - whether to make it better or to kill it.
As they chose "to kill" - we stopped upgrading/supporting/thinking about/... WinPhone app too. 
Life is beautiful but volatile.

Windows Phone users are joining SafeUM testers team today! Testing of Android and iOS versions is very successful and we want to thank YOU, our users! SafeUM Team is very often asked If there'll be a Windows Phone version of SafeUM. Now we are ready to announce its beta testing.

To participate in testing, you have to leave an application on our site or our official Facebook page. All people, who applied, will get a detailed instruction. We are looking forward to your suggestions, comments and reviews about SafeUM. Authors of the most constructive feedback will get free Premium subscription for a year.