Federal government is using data from push notifications to track contacts

Government investigators in the United States have used push notification data to pursue people of interest, Sen. Ron Wyden (D-Ore.) said in a letter Wednesday to the Justice Department, revealing for the first time a way in which Americans can be tracked through a basic service provided by their smartphones.

Wyden’s letter said the Justice Department had prohibited Apple and Google from discussing the technique and asked it to change the rule, noting that his office had received a tip that foreign governments had also begun requesting the push-notification data.