Well then, they should make Skype the default messaging app, and have regular texts and FB text roll through Skype too...like with Hangouts, and iMessages.
This way us Windows Phone users can text for free between us, like with iMessage. Plus be able to switch to video chat right in that same skype app, like face time. One messaging app to rule them all....I should be able to chat with my AT&T peeps, as well as my Windows Phone folk....all for free in the same exact app. Skype.
It already has a famous name, use that to your advantage...and promote in-house, free, CONVENIENT texting