Symantec offers security software for smartphones.

"Norton Smartphone Security, which shares a common name with Symantec's line of popular desktop antivirus products, combines Norton AntiVirus technology, a firewall, and anti-spam for messages sent via the Short Message Service, or SMS. The software is compatible with smartphones that run the Windows Mobile and the Symbian operating systems...

Symantec isn't the only desktop security provider realizing the huge potential to offer similar products to mobile users. McAfee this week announced that its VirusScan Mobile software is now available for download on its Web site. The mobile security software protects against threats that originate from e-mail, instant messages, and multimedia downloads. But VirusScan Mobile currently only supports mobile devices that run the Windows Mobile 5 Smartphone and the Windows Mobile 6 Standard Edition."