Hi. I am thinking about getting either a new iPhone or iPad, only one. As far as I understand the system, the only difference is probably that an iPhone could make calls while an iPad couldn't, and iPad usually has a bigger screen In other words, is iPad usually only for people who need bigger screen for gaming or watching videos? If I don't play games or watch videos, is it wiser to get an iPhone which is more portable and can make calls? In addition to gaming and watching videos, anything that an iPad could do more than an iPhone??