If you really don't want people to get into your phone, you can hide the lock screen entirely, leaving the unlock button hidden somewhere on the screen only you know.
While a pattern lock is safe in theory, it always leaves behind smudges that a snooper could find and use to unlock your phone. Hidden Lock takes a different approach, showing your phone's home screen as the lock screen but blocking any input until you click on a special, invisible lock button -- which you can hide anywhere on the screen you want.
Check out the video above to see how its done. You can change the size of the lock button, put it anywhere on the screen, and even hide the "Hidden Unlock" dialog, to further confuse any phone thieves. It's a very clever way to keep other people locked out of your phone, while keeping you just a tap away from getting in.
Hidden Lock is a $0.99 download for Android only. You can also grab the free version to try it out before you buy, though the Pro version has some handy feature that make it a bit more secure.