Cabir.Y is a minor variant of Cabir.B. The only significant difference is that Cabir.Y spreads in a file named yuanV2.SIS while Cabir.B uses a file named Caribe.sis. For more details, see the description of Cabir http://www.f-secure.com/v-descs/cabir.shtml
Disinfection
F-Secure Mobile Anti-Virus will detect Cabir.Y and delete the worm components.
If your phone is infected with Cabir.Y and you cannot install files over bluetooth, you can download F-Secure Mobile Anti-Virus directly to your phone: