If you're working with a spreadsheet or a thread of correspondence or a set of data, I'm not sure you're doing your best work if you're doing it on an iPhone.
When you think about Uber and Airbnb and the other companies that are turning things upside down, Uber isn't big 'cause they ran a lot of ads. They're big because someone took out their iPhone and said to their friend, watch this, and pressed a button and a car pulled up.