I had an old Motorola KRZR that I wanted to purge all the data from prior to getting rid of it.  Of course it was not as easy to figure out as I would have hoped.  Eventually I found this solution.

1. Goto opcode screen by entering: CLR, 0, 4, 8, 2, 6, 3, * (Note: sequence must be entered very quickly.)
2. From the opcode screen enter: 18* and click center radial button on phone.
3. Then enter 0 and click on center radial button.
4. Wait and it will say success after a short time.  Press CLR.
5. Enter: 18* and click center radial button on phone.
6. Then enter 1 and click on center radial button.
7. Wait and it will say success after a short time.  Press CLR.

It may or may not reboot after entering commands.

Exit out. Contacts, Pix & Flix, Called #’s, etc should all be deleted…