Thanks guys.

Plumble is the best app out right now.  There is a free version and a donator's version.

Yes there are a couple of clients.  Go to playstore.  I know TonyK has a mumble client on his phone and it works quite well.  Brent Allsop also uses his phone I believe.  I have one but I don't use it so I can't speak from experience.

Is there any way to listen live to the mumble conversation with just a smart phone?