My advice is just play safe because we are all talking abour money here which is very critical if you risk it to a not sure place. I'm not saying that there are no credible mobile trading apps in the industry but for me it is more comfortable to use the typical ones especially Binance. Actually I love mobile apps because smartphone is more portable than laptops/PCs, I use mobile btc wallet and mobile browser (for visiting this forum, CMC and cointelegraph) but to be honest I still prefer laptops for doing such things if ever I have the chance simply because it has a better web interface thus making it user friendly.

Well, if you are really eager to try mobile trading apps then try cex.io, coinbase or bitfinex. Good luck