I'm using a Galaxy S2 (Samsung smartphone) and I do often use Metatrader app to trade, it's a common trading app.
Quote from worldelite:
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