Apparently, my choice has become laughable. Also, I said smartphone. Well, you need one good reason?
I work on several AC and heating systems HVAC. Anyways, my job has a nice server with several replacement parts and recommended system installations and much more. If I ever need to look up a part or see if we have it in stock, all I do is punch in the model and serial number of a unit and voila, everything about it is revealed on the screen. Quite handy. Not to mention, boss sends out certain emails regarding requisitions, quotes and the likes to me while I'm out on the field.
Good enough?
However, I sense you, yourself, are a teen because of the very form and manner you are coming after me for my comment. I can assure you, no teen needs a smartphone. Their needs is centered around Facebook (which a desktop will do) and gossip, which can be done via texting as well. None of those require parents to splurge over $15 or $30 of data allowance a month.