I found a cool chart on this site that reports on various models and whether or not they work. It seems to be pretty old and out of date though since Galaxy S4 isn't on there. Lat I had heard, All the Galaxy S phones were supported but it showed that there was even a difference between the same phones on different carriers. So I have 2 main questions:
1) On Sprint, is Galaxy S4 (and S4 mini) supported and does it work? I'm talking about Jabber Voice (IM seems to work on everything).
2) On Sprint, will the new Galaxy S5 work?
Is there a direct email I can use to find out this answer if no one knows here definitively?