WSJ.com Senior Technology Editor Julia Angwin reports Apple's iPhone and Google's Android regularly transmit user location data back to those companies, based on data analyzed by The Wall Street Journal.
The companies' smartphones regularly transmit locations back to Google and Apple servers, respectively, according to data and documents analyzed by The Wall Street Journal.
Research by a security analyst this week found that an Android phone collected location data every few seconds and sent it to Google several times an hour. Apple disclosed in a letter to Congress last year that its phones "intermittently" collect location data, and the company receives it twice a day.