I use phone whenever I already have strategy set on my trade for the same as your due to convenience and quick reaction whenever there is a trend on the coin I’m trading that time.

But I use my desktop to analyze first the coin I’m going to trade using tradingview because it offers much better visibility especially on finding patterns on charts and signal on indicators which is very hard to do using small screen such as mobile.

I usually combine both desktop and mobile phone but most of the time I use mobile since my trading strategy is always long term right after I determined the range of the price changes of certain token.