Reporting a new crop of variants, a security firm warned that the Cabir cell phone virus is becoming more of a threat. Earlier versions of Cabir, which spreads through phones running the Symbian operating system and Bluetooth wireless technology, won attention this summer for being the first worms to spread via smart phones. But they were quickly determined to be relatively harmless, proof-of-concept programs. As it issued alerts for Cabir.H, Cabir.I, and Cabir.J, security firm F-Secure warned that the latest versions of Cabir are evolving beyond its comparatively benign predecessors.