The device in your purse or jeans that you think is a cellphone — guess again. … Thanks to the explosion of GPS technology and smartphone apps, these devices are also taking note of what we buy, where and when we buy it, how much money we have in the bank, whom we text and e-mail, what Web sites we visit, how and where we travel, what time we go to sleep and wake up — and more. [cont.]
Peter Maass and Megha Rajagopalan (NY Times)