In a letter sent to Sen. Ron Wyden, a Democrat from Oregon, Verizon's chief privacy officer Karen Zacharia said the company was ending its contracts with location aggregators like LocationSmart and Zumigo.

"We are committed to protecting the privacy and security of our customers' location information, and will keep you informed as we execute our plan to terminate these location-based aggregation arrangements with the aggregators," Zacharia wrote.

Major wireless carriers are allowed to sell real-time location data to third-parties, which is often used for targeted advertising from advertisers.

In Verizon's letter, it noted that services like truck rental companies often use location data provided from phones to help customers who have trouble on the road.

The service allowed people to find anybody using their phone number, tracking them down based on location data that wireless carriers provided.

But that location data had been abused, where a former Missouri sheriff used Securus Technologies, a service for monitoring calls to prison inmates, to track down a judge and five other police officers.

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