The U.S. Marshals Service is reportedly flying over parts of the country with devices called "dirtboxes" that can collect large amounts of data from the cellphones of anyone on the ground.
The new Google software for mobile devices, Android's sweet new "Lollipop" flavor, brings security improvements and easier ways to view and respond to notifications, and a slew of new features.
Wireless? Bar codes? What's the best way to pay with your phone? Apple Pay, Google Wallet and others use NFC, while other big merchants are developing their own systems based on bar codes.
Attempt at your own risk: For an entire week, one reviewer left all cash and credit cards at home to see how well the various wallet-free mobile services work in the real world. How hard could it be?
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