How to set security code for Nokia 6300 ?

[raulk]

When I get in to the office my phone being used more than often by my colleagues. Just to get a rid of the thing I wish to set a security lock code for my Nokia 6300. Could anybody advice me the steps for ?

[Ross]

Menu -> Settings -> Security -> Security Level = 'Phone' and enter the security code.
Then,
Menu -> Settings -> Security keyguard = ON, for additional security you can set automatic keyguard ON.