The iPhone's screen is 3.5" ... where exactly do we draw the line between "phone" and "tablet"? Sorry, but I'd almost put this in "no man's land" ... too big f

The iPhone's screen is 3.5" ... where exactly do we draw the line between "phone" and "tablet"? Sorry, but I'd almost put this in "no man's land" ... too big for a phone in my pocket, too small to be useful as anything else.