<A target="_blank" href="http://www.pcworld.com/article/235276/your_old_smartphones_data_can_come_back_to_haunt_you.html#tk.rss_news">Your smartphone is a tiny, portable computer.</A> It has a hard drive that holds information - like passwords - just like your laptop. And, just like your laptop, you need to wipe the drive before you toss the device.