Samsung SCH-8500 - Manual (Page 99)

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The default lock code for your Sprint PCS Phone is generally
0000 or the last four digits of your phone number. You can
enter a personal lock code and later change the lock code as
often as you like.
To enter a new lock code:
1. Press to display the Main menu.
2. Press for Setup / Tool.
3. Press for Security and enter your current lock
code.
4. Press for Change Lock. The current lock code
displays.
5. Enter a new, four-digit lock code by pressing the digit
keys.
6. Press to save the new lock code or to exit.
Note: Your phone does not allow viewing of the lock code
unless you know the lock code (this is for obvious security
reasons). So, if you change the lock code, be sure to write
down the new code and keep it for your reference.
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The Security menu allows you to lock the phone manually or
automatically when powering on your phone or to leave the
phone unlocked.
To lock the phone:
1. Press to display the Main menu.
2. Press for Setup / Tool.
3. Press for Security and enter your current lock
code.
4. Press for Lock Phone.
END