Sanyo SCP-4000 - Manual (Page 62)

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How to Lock Your Phone
You must enter your lock code to view the security menu.
Typical default values are either the last 4 digits of your phone
number or Social Security number. When your phone is locked,
you can only make emergency calls (9-1-1, ABC 2 and your
user-specified Special Numbers) or receive incoming calls. All
other functions of the phone are disabled.
If you forget your lock code, take your phone to the nearest
Sprint PCS Center.
1. Highlight and press OK .
2. Enter lock code.
3. Highlight and press OK .
4. Depending on your preference, highlight either or
and press OK .
Unlock Phone
1. Highlight and press OK .
2. Enter lock code.