I don't understand what you mean? Most crypto trading platforms have a mobile friendly app. So obviously, you can choose what ever exchanges suited you. You can also look at the top exchanges in coinmarketcap, maybe that could help as well.
I need an exchange where I can deposit and withdraw dollars that has lower fees than Coinbase. Does that make sense?
Maybe you can see and visit some of these exchanges Bitstamp, Kraken, Gdax and Gemini. Because that seems to be the exchange that you mean and you can compare it yourself.
I'll take a review on these trading sites mate, and based on the experienced I had with my trader friend he's using binance trading app but I've never been have time to learn that thing through mobile. Maybe I can do personal research after seeing these recommendations here, and this could be a big help for me using mobile in trading using some dollars.