The internet is everything, you can find anything online, and being that you have a mobile device with access to data, you can pretty much get any information on anyone and do what you want. At the same time that power can be used for bad just as well as good.
So it all comes down to knowing all of these, do you think u want or need a cell phone. You do things more on the go or you dont mind waiting untill you get home to handle your things.