Bluetooth
http://www.google.com/search?hl=en&q=bluetooth+virus »
That said, let's not kid ourselves... VZW is crippling Bluetooth for money, not security. And viruses are an argument for better software/security, not wholesale feature-crippling.
For example, if Microsoft followed VZW's example, their next OS (Longhorn) wouldn't be so much about improved security as it would be about stripping 90% of the features out of their OS. Admittedly, that is the 'quick and dirty' way to improve security, but its certainly isn't the best way... not if your customer base actually wants any features. 😳