One user claims he was unwittingly signed up and charged by data firm KKO after downloading what he was led to believe was free Spider-Man game for his son.
KKO sells ringtones, wallpaper and videos for weekly fees of PS4.
Jason, from West Wittering, West Sussex, is demanding a refund after spotting unexpected payments to KKO.
PhonepayPlus, which can fine a company up to PS250,000 for every single breach, said: "Following consumer complaints about certain KKO Mobile services, we are carrying out an investigation of relevant services.
The company offers a full package of consumer entertainment services (personalization, music, news, games, lifestyle, videos, mobile communities), marketed under the KKO
brand or in partnership with operators' portals and leading media companies.
Peregrine Systems will continue to offer the current KKO software products for the rail and transit industries, while developing a new rail and transit software solution built on its own FleetAnywhere product architecture.
The KKO computer software division staff brings to Peregrine Systems a thorough understanding of the unique business requirements and operating environments of rail and transit operators," said Steve Gardner, Peregrine Systems president and CEO.
KKO and Associates is a professional services and consulting firm specializing in Transportation Planning and Management Information Systems for the transit industry.