You can set up a security code to lock your keypad in case your locked phone opens in your pocket and calls one of your contacts, annoying them and potentially running up a huge bill. The code will also stop a thief from using your stolen phone to run up a huge phone bill before you can alert your network provider.

To set the security code, click Menu > Settings > Phone > Security keyguard. You'll be prompted for the Security code. By default this is 12345. Enter this and press OK. Select On and click Select to see the message 'Security keyguard activated'.

Now when you lock your phone you'll see the message 'Keypad locked with security code'.

When you next unlock you'll be prompted to enter the security code. Type your code and click OK to activate your keypad.

Changing the security code
Of course, if any potential phone thieves are reading this, they'll now know the default security code is 12345.

To change the security code, go to Menu > Settings > Security > Access codes > Change security code. When prompted, enter your current security code and click OK. The enter your new security code (a PIN between 5 and 10 digits in length), click OK and enter the new code again to verify it. Click OK and you'll see the message 'Security code changed'.