3CX and windows-phone device use is growing in the Caribbean and especially in Saint Lucia. I notice that a client is listed in the windows phone store but it is currently unavailable. I am assuming development has ended on it? If so this is a major issue for enterprise byod in our region. It should be easier to port the iphone variant of 3cx client over to windows-phone. if you have any issue i suggest going that route. Please consider this as the situation is kind of dire at this point. Winphone user base globaly may be low. but when you narrow down to 3cx enterprise userbase, there is a large percentage that use window devices not excluding windowsphone especially with the emergence of UWP and continuum.