hi everyone i want help for trading which exchange is best for trading on mobile and low fees 
At least all of trading exchanges have good mobile view. You just to have a phone with good specifications to make your browsing smooth at their platform. Since it's real time trading it's a must to have a good specs phone. Less than 1gb ram will do but it sort of laggy especially in the native browser e.g Coinexchange.io , Bittrex, Poloniex.
What coins you are going to trades? You can check Crytopia. Their mobile version is some kind of smooth based on my experience. If you coins isn't present on Cryptopia then you have to check some of the suggested trading to see if they are smooth on your phone's browser.
Cryptopia is very poor for the number of coins. More people said it under this thread, I'm surprised. Bittrex and Poloniex are more than enough. But I feel negative about poloniex, I don't know why. Be careful for it.