While mobile viruses will certainly become more popular as smartphone sales increase, as of 2011, they're a very minor concern.

In July 2004, computer hobbyists released a proof-of-concept mobile virus named Cabir.

The hack was criticised by Nokia for potentially increasing the threat posed by mobile viruses as unsigned code can be executed.

A mobile virus is a piece of malicious software that targets mobile phones or wireless-enabled PDAs.

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All classify the virus, like the four or five other known mobile viruses that have emerged over the last year, in the relatively benign "proof of concept" category, meaning that it is currently a low-level threat.

The first instance of a mobile virus occurred in June 2004 when it was discovered that a company called Ojam had engineered an anti-piracy Trojan virus in older versions of their mobile phone game Mosquito.