Denial-of-service attack possible on Nokia Series 60 smartphones

Executive summary?
  1. Significant threat.
  2. Back up your phone daily. If the DOS attack is successful, recovery requires a total reset which means you lose everything in phone memory.
  3. If strange messages start appearing with the @ symbol in them, shut off your phone or go into airline mode (no cellular reception). Backup to memory card, delete the strange messages and then backup to memory card again.
  4. Stay tuned for news of a patch from Symbian.
The gory details are here at FierceMobileIT.