This is another Symbian Series 60 trojan named Fontal.A by f-secure. This is a SIS file trojan that installs a corrupted file which causes phone to fail at reboot. If user tries to reboot the infected phone, it will be permanently stuck on the reboot, and cannot be used before disinfecting. Currently the only known method of repairing the phone is to use the reformat key combination, which causes the phone to lose all data.

In addition of installing the corrupted font file the Fontal.A also damages the application manager so that it cannot be uninstalled, and no new applications can be installed before the phone is disinfected.

The Fontal.A is a trojan, and as such it does not spread by itself, not over bluetooth or any other channel. F-secure said the most likely way to user to get infected would be to get the file from IRC or Peer to Peer fileshare and install it to the phone. So to avoid Fontal and other trojans, download files only from legal sources.

F-secure antivirus for Symbian is available here

http://mobile.f-secure.com