Nobody talked and auto enable voice chat when speaking didn't work with my head phones. Push to talk seemed to work but you have to press a button on the screen which is awkward.
Server searching has no language filter. Few kinks there at the minute.
Had a few games on this now and the lobby system has a bug that keeps dead lobbies available to join which is pain in the ass. Best way to get a game is to make a lobby and invite people or use a room number someone has shared. Don't bother trying to join a lobby off the list as the games never start.
I'm still not sure how how good the voice chat is but it definitely works. Controls are as expected on a mobile, abit finicky and abit slow but it works.