Switching data to a new phone as a guest

So, I've been playing GoH on my old phone for months now, but it's dying out and I'd like to get the data to my new phone. The problem is my account on my old phone is as guest and it refuses to let me log in to my google play to overwrite it so I can transfer the data. As it is my old phone won't last too much longer and I've sunk a lot of cash into the game, I really don't want to see it ruined by guest status on the phone. Is there any way I can use the player ID and enter it somewhere in the new phone?