Froyo (Android 2.2) keeps the unlock pattern that we’re all familiar with for securing the unlock screen, but adds PIN and Password options as well. That means you don’t have to rely on remembering some pattern to unlock your screen.
1. Go to the Home screen.
2. Select the Menu key.
3. Select Settings.
4. Select Location & security.
5. Select Set up screen lock.
6. Choose the desired method for screen unlock security, choices are None, Pattern, PIN, or Password.
Depending on the selected option, you will need to assign the desired pattern, PIN, or Password.
