1. Take out the phone's battery and then put it back in
2. Wait for the red OLED to go out; press'n'hold the Back Arrow or Escape keys.
3. If you see the Safe Mode prompt, then release buttons, and click OK.
4. To exit from the safe mode, just take out the phone's battery and then put it back in. Oh, and don't hold Escape or Back Arrow when doing that (also, why would you).