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Your Apps Are Watching You

A WSJ Investigation finds that iPhone and Android apps are breaching the privacy of smartphone users

Few devices know more personal details about people than the smartphones in their pockets: phone numbers, current location, often the owner's real name—even a unique ID number that can never be changed or turned off.

These phones don't keep secrets. They are sharing this personal data widely and regularly, a Wall Street Journal investigation has found.

An examination of 101 popular smartphone "apps"—games and other...

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