Smartphone anti-virus program in Korea

SK Telecom, in response to the first mobile phone worm in the world, ahs developed the industry's first antivirus program for wireless Internet platform for interoperability, Korea's standard for mobile phones.

Interestingly, it is pretty easy to get rid of the worm, if you got it in the first place. And, secondly, how big can a program be, for a virus or a worm, when there is actually none existing?