Sprint Nextel LA990009-0462 - Manual (Page 79)

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Getting the Most From Your Phone
Display
For information on changing Backlight, Greeting or Contrast
settings, see Handy Tips pages 20-21.
Display Menu
Security
Accessing the Security Menu
You must enter your lock code to view the Security menu. If you
forget your lock code, try using the last four digits of your
Social Security number, the last four digits of your Sprint PCS
Phone Number or 0000.
Security Menu