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Police said Hung, 41, and the employees... developed mobile phone-monitoring software and sold it to more than 14,000 people between September 2013 and May 2014.
Hung and the six employees earned around VND900 million (US$42,000) from the illegal activity, police said.
For VND400,000 ($19) per month, Viet Hong's customers could install the Ptracker software onto anyone's smartphones to listen on calls, read text messages, access contacts, track the owners' movements and use the phone to listen in on their daily lives.
The stolen information was archived on Viet Hong’s servers and could be accessed by signing up for a paid account.
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