If you want to play online soccer on mobile, here is MamoBall.

MamoBall is a realtime online multiplayer 2D soccer game based on mix of football and hockey that you can play with your friends or players from all around the world. You can play 4v4 ranked matches to earn trophies and climb to upper leagues or you can create lobby rooms and play from 1v1 to 4v4 custom matches with your friends.

The game mechanic seems so easy but we should say you firstly that it requires high football intelligence and you cannot beat your opponents without a good strategy. It will take some time to get you used to the controls but once you used to it you will never be able to give it up.

Currently there are a lot of tournaments organized with thousands of players in many countries via Discord channels. Come early, create your team and take your place in these tournaments.

No need to tell more, if you want to see it then jump into the train.