Whoever trying to play multiplayer with two phones, follow these instructions :
Phone 1:
1) load-outs
2) top right three line
3) add controller (add only one)
4) chose "force to be player 1"
Phone 2:
Do 1,2,3 above
4) "force to be player 2"
If it still doesn't work in the game. Then press the "start" button on phone 2 to register it as a controller in the game.
Thanks.