1. First of all activate your phone’s internet connection. Without the Internet, you will not be able to unlock the phone. Also, it is important that the location is also turned on.
  2. Now you can search Google Device Manager on another device. Go to the top link at the top.
  3. You now have to login with Google account. Keep in mind that log in with the same Google Account that is linked to the locked device.
  4. After this you have to select Lock option in Android Device Manager. After clicking on it the phone will be unlocked. Now you can set a new password / pin / pattern.