This app was mentioned in 2 comments, with an average of 1.00 upvote
We have been using Mahjong and Friends for a while in the past.
Pros: English interface, It has no turn timer that I am aware of, you can choose an avatar and the interface is somewhat customizable. Setting up a game is easy and it auto-fills with AI opponents.
Cons: The person who hosts has to buy the game, the others can join with the free version. We randomly lost connection and while most of the time the gamestate was preserverd, sometimes it was not and we had to start over.
If all of them are new and they don't really care about randomly restarting I think it is a solid way to play as a group.
https://play.google.com/store/apps/details?id=com.mjguy.android.games.mjfjp
Though the calls are Chinese (Chii as Chow, Pon as Pung, etc) Interface is English tiles have identifiers and all yaku names are in English. (It also tracks what Yaku you've achieved)
You can also play multiplayer with Bluetooth or Mobile Hotspot