Not set up a security code so that anyone trying to access your phone will need to code to get into it.

1. Press the Nokia Menu key to the left of the 1 and 2 keys then choose Tools.
2. In the Tools screen click on Settings
3. In the Settings screen click on Security...
4. In the Security screen click on Phone and SIM
5. Scroll down and select Lock Code
6. Now type ‘12345’ and then choose OK with the left Selection key. ‘12345’ is the default lock code for the Nokia N73
7. Next type your new lock code then choose OK with the left Selection key. Your lock code can only include the numbers 0 to 9. You will be asked to enter it again. Do this then choose OK with the left Selection key again. You will see a message that says ‘Lock code changed’
8. Next click on Autolock period. You can set your phone to lock itself automatically after a period of inactivity. To do this click on User definedwith the scroll key. Now enter the number of minutes after which you want the phone to automatically lock itself and choose OK with the left Selection key
9. You will have to enter the lock code you set up and then choose OK, and finally you get the message ‘Code accepted’. Now after the period of time you set the Nokia N73 will lock itself and a screensaver will appear to show that it is locked