Well they are safe if you get it from the source itself. But the thing with trading thru mobile is that the screen is too small for me (although there are a lot of smart phones with large screen now).

So for me, I still go with the old and traditional way of using m pc/laptop to trade. Lots of advantage on my end. And I hear that people sometimes misclick their trading with their mobile phone, so lots of hassle specially you are involving yourself with huge amount of money here.

Edit: I only have Binance apps and some local trading platform on my mobile.