Siemens U15 - Manual (Page 147)

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Security
Locking and Unlocking Applications
You can lock many phone applications (for example, the
phonebook) so that users must enter the unlock code to use
them.
Find the Feature M > Settings > Security
> Lock Application
Press To
1 keypad keys enter your four-digit unlock code
2 OK (
+
) open the lock applications menu
3
S scroll to the application you want
to lock or unlock
4 CHANGE (
+
) select the application
5
S scroll to Locked or Unlocked
6 SELECT (
+
) select Locked or Unlocked