The built-in pattern lock tool is useful for adding an extra layer of security to your Android smartphone. What happen if you forgot your pattern and want to know how to unlock android phone or tablet? Pattern lock is very important for those who have sensitive data or have personal files in their android devices. This will help you to prevent your device from unauthorized use but the trouble starts when you forget it. This tutorial will show you how to unlock and reset your android device lock pattern if you have forgotten your lock pattern and can remember your Google/Gmail account.