In general, you should exercise caution when accepting applications sent via Bluetooth or opening MMS attachments as they may include software harmful to your phone or PC.
You should not approve or download content to a mobile device from an unknown or unreliable source. Trusted sources may include operator portals and other well-known brands, such as the Nokia Software Market.
The malware sends a copy of itself to "visible" Bluetooth devices. However, the malware will not affect the device unless the user actively takes the step of "accepting" it, by pressing a key to do so. Additionally, the malware cannot send itself to devices in which Bluetooth is switched to "hidden" mode, or is switched off. The malware cannot be spread over mobile networks.
According to tests performed by Nokia, the currently available devices that could be affected include Nokia models that run on the Series 60 Platform and are Bluetooth-enabled.
Since Bluetooth is essentially a means of sharing data, the best precaution is always to confirm the contents with the sender before sharing the data and not to accept any files from unknown or untrustworthy sources. If the malware is accepted on a device, it can be deleted without causing harm to the device.
If you suspect that your mobile phone is infected by malware Cabir, contact Nokia customer service in your home country for more information.