The iPhone OS lock screens consist of a slider bar that does the job of locking and unlocking your iDevice. But if you want to have a much more intelligent lock screen and not just the slider or a numbered lock then this Android Lock screen is just for you.
Setup Android lock screen for iPhone 3g/ 3GS and iPod Touch 2G/ 3G.
Make sure you own a jailbroken iDevice and have Rock store installed on it. Just like Cydia , Rock is another files store for jailbroken iDevices. Just search for Rock in Cydia store and install it. Now search for ‘Android Lock’ in Rock store and install. After installing go to iDevice Settings > AndroidLock and then click Change pattern. Now you can decide on your lock pattern by swiping across to form a pattern by joining the dots. Do it twice to make sure you have set up a lock screen successfully.