hi everyone i want help for trading which exchange is best for trading on mobile and low fees 
On mobile you can use cryptopia or bittrex ill try to open the website using my phone and i do not experience any problem. low fee exchange is poloneix Hitbtc and coinexchange.
hope it helps .
Whether mobile or desktop those exchange platform you had mentioned are all can be use in both. And I also agreed that those 3 platform too are all good to exchange our coins or bitcoin. Because it has a good market in this industry.