Hi there, installed V15 , and tested with Android Phones and Windows Mobile 10. With the android phones no problems at al. installing 3CX from the welcome message works great! With the windows mobile 10 phone ( Lumia 950 ) , installing from the store is no problem, downloaded the config file, installed it and my phone will register with the wifi connection, not via the mobile network. (same settings as on the android phone) With the wifi connected I can make a call but I can't receive a call. the application is active when i try to call to the phone. After removing the app from the phone and restarting the phone I downloaded the 3cx app again from the store and installed it. Then I opened the config file and now it is possible to make and receive calls. Now its waiting for the push mode to work.