Method 3: Android device manager Using Android device manager you can remove the lock-screen or by-pass it too. This will work only, if you have logged into the Google account on your phone.

How to Bypass Android Lock Screen when You Forgot Password DroidKit’s Screen Unlocker is a powerful tool designed to effortlessly remove screen locks on a wide range of Android devices.

Researchers show how an attacker can crack your Android pattern lock from a distance and that complex patterns are the easiest to identify.