Samsung Illusion is a very good smartphone, you will enjoy using it!
Follow this steps and you will be able to set the lock screen you wish without a third part app.
Menu > Settings >Security > Screen lock
There are a few types of screen lock you can choose from.
I bought a Samsung Illusion yesterday and I am very excited with it! The use is very simple and the applications I can download are giving me so much features!
I have downloaded an application to lock my screen, but I know that this feature is available ether way. How can I use the lock screen services without downloading an application? Where is the PIN option?