Using your mobile to access your exchanges account is a very bad idea. Especially if your 2FA device also is your mobile..
In this case you actually don't have any 2FA anymore. It would be enough to compromise your mobile phone, to get access to all of your coins on the exchanges.
Security-wise that's a disaster. Now add that to the fact that most mobile manufacturer skip from 1 up to 4 android-security patches (while showing you the most up-to-date version).
This creates a lot of gateways for an malicious actor to compromise your mobile and therefore also your cryptos stored on the exchange.
I'd heavily suggest NOT to use the mobile phone (or at least not the same device as your 2FA device) for trading etc..
Anyone who's seriously concerned about their security while trading in a smartphone should really heed to
bob123's post. This is very important as this could wipe your entire portfolio (money) if you're not careful with what you are doing.
As for this instance, I have a separate phone (that I rarely use - its main purpose is for 2FA only) and I have a different phone that I use for trading/gambling and other stuff (if you know what I mean
). Yes, I trade on my main phone and I know that it is not recommended at all but I'm doing extra step just to be on the safe side. The convenience/portability that it provides is so good that I just can't let it pass.
Another advice is that verify first those applications if they are truly the correct trading app for your exchange. There are so many applications that pretend to be the legit one but their objective is to get credentials in an illegal manner.