By Tarmo Virki
(Reuters) - Some advertising networks have over the last year started to secretly collect app users' contacts or whereabouts, and could now have access to 80 million smartphones globally, U.S.-based mobile security firm LookOut said.
Over 80 million apps have been downloaded which carry aggressive ads and the problem was rising, LookOut said as it unveiled on Monday the first industry guidelines on how application developers and advertisers could avoid raising consumer angst over too aggressive ads, which could hit badly the $8 billion industry.
"Aggressive ad networks are much more prevalent than malicious applications. It's the most prevalent mobile privacy issue that exists," Kevin Mahaffey, LookOut's technology chief and co-founder, told Reuters in an interview.
Some more aggressive networks collect users email addresses or phone numbers without permission, while others install icons to home screens, track users whereabouts or push ads to notification bar.
"Most ad networks are not aggressive, but there are a few pushing the limits," Mahaffey said.
(Reporting By Tarmo Virki; Editing by Marguerita Choy)