I'm using a Galaxy S2 (Samsung smartphone) and I do often use Metatrader app to trade, it's a common trading app.
I do use thge MT app for iphone, its quite fast, but for charting i use MT4 on my desktop, I just like checking the charts on the go since most my trades are position.
I prefer trade on my monitor, it's larger. I see almost professional trader has multiply-monitor like this. Like these: http://mntrading.com/typo3temp/pics/37fea7f747.jpg http://small-cap-growth-and-value.com/wp-content/uploads/2011/10/share-valuation-01.jpeg http://www.forex-central.net/img/professional-traders.jpg
honestly there is no avoiding it! some might think that position trading or swing trading can be a bit slow and does not require you staying infront of a monitor, but on the contrary, we tend to relate almost everything to forex, we listen to news on tv or even have the laptop and pc open aside from checking charts on my tab and iphone, its an addiction its like staring at canddle sticks syndrome or something LOL
maybe its more applicable for people f rom europe, but i think you can request it if you want to, its an international card, but fees might be grater but im not sure.
Those are experienced. I think we are not professional like them so we can trade with only 1 monitor. When we trade on more one pair, we can need more monitor.