Samsung SCH-T300 - Manual (Page 148)

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Restrict
This feature allows you to restrict the use of your phone.
To restrict the phone:
1. Press to display the menu.
2. Press for Security.
3. Enter your current lock code.
4. Press for Restrict.
5. Press to scroll between ‘Yes’ or ‘No’. Press to confirm
the restriction.
6. Press to exit.
Lock Code
The default lock code for your phone is the last four digits of your
phone number. You can enter a personal lock code or change the lock
code as often as you like.
To enter a new lock code:
1. Press to display the menu.
2. Press for Security.
3. Enter your current lock code.
4. Press for Change Lock.
5. Enter a new 4-digit lock code by pressing the numeric keys.