Binance and Coinbase have Apps for Android Applications.
Have them both, but most of my trading goes through Binance, I use Coinbase just for storage of some of my Crypto.
Almost a lot of cryptocurrency know that and also they do that. In my country we have our own wallet which compatible some popular coin and it named "coins.ph" where we can withdraw into fiat. It is good to have that every country has their own wallet in a legal way.