Advance Device Lock Application: Application Locker For Nokia Symbian S60v3 And v2. As you might guess, this application will let you lock everything on your phone like folders, apps, untill the message feature that your phone has, and will be accessible only after the correct code is given. This application is just some Kilobytes in measurement but it has an amazing and incredible feature. Nobody will know what things are on your phone if you don't let 'em know, unless he deletes the application that which you'll notice it if he does so.
Here are the download links.
Advanced Device Lock S60v3.zip
Advanced Device Lock S60v2.sis
A few minutes ago i have also posted three kind applications that you may want to check 'em too. Here they are.
Symot Draw Sms Application For Nokia Symbian S60v3 And v2: MMS Sender And Editor
Nuance Talks: Voice Command Application For Nokia S60v3 And v2
WaveSecure: Anti Theft Application For Nokia S60v3 and v2