by Mark Ward 7 November 2011 BBC UK
A national computer security campaign is urging smartphone users to do more to protect themselves from unwittingly downloading malware applications.
Get Safe Online says that there has been an increase in smartphone malware as the market has grown.
Criminals are typically creating Trojan copies of reputable apps and tricking users into installing them.
Once on the phone, the app can secretly generate cash for criminals through premium rate text messages.
Get Safe Online, a joint initiative between the government, police and industry, said it was concerned that users of smartphones, such as Android devices, were not taking steps to protect their devices.
Get Safe Online said fraudsters are designing apps which generate cash secretly in the background without the owner realising until their monthly bill.
A typical scam involves an app designed to send texts to premium rate services without the user knowing.
Apps can appear to be bona fide software or sometimes masquerade as stripped down free versions of well-known games.
Rik Ferguson, a hacking researcher with internet security firm Trend Micro, said: “This type of malware is capable of sending a steady stream of text messages to premium rate numbers – in some instances we’ve seen one being sent every minute.