Samsung SCH-3500 - Manual (Page 78)

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Lock code setting.
The default lock code for your Sprint PCS Phone is
generally 0000 or the last four digits of your phone number,
depending on activation. You can enter a personal lock
code, and then 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 Security and enter your current lock
code.
3. Press for Lock Code. The current lock code
displays.
4. Enter a new, four-digit lock code by pressing the digit
keys.
5. 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.
Locking the phone.
The Security menu allows you to lock the phone manually,
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 Security and enter the lock code.
3. Press for Lock Phone.