Discard cell barred information.

Should work on all software versions.
1. Go to calendar (menu - 8)
2. Make note / reminder
3. Enter some text into the edit box
4 . Hold clear until whole text is cleared, then press Back
5. Press 0. Main screen is shown but a space appears on the screen. You can't see it of course.
6. Enter 4 digits (1234, for example)
7. Use the down arrow to move the cursor to the left side of the numbers and the space (2 times down arrow)
8. Now enter 6 digits and press the green "Call button".Wait some seconds...
the phone will now flash the background light and finally reboot.
The trick should also work on other menus like the profile menu...