How this can be happened?
Let’s say one of your friends have told you about this for the first time and you have set the lock pattern on your phone. After some time you may have suddenly forgotten your lock pattern. What you are going to do?
If you have entered the wrong pattern five times then you need to wait for another 30 seconds to unlock the device. If you forgot you screen unlock pattern then you need to reset it. The simple procedure is mentioned below –
1. Continue to enter the unlock pattern five times until you are prompted with forgot password (forgot pattern in some handsets) at the bottom right side of the screen
2. Tap on the Forgot Password option and you would be prompted to sign in with the existing Google or Gmail account information. You need to provide the ID when you first register or activated your phone. If you have that, it would be easy to get in for you and then change the unlock pattern (atleast by now you would be remembering your unlock pattern).3. If you don’t know the Gmail ID or the password is wrong then there is only one solution to hard reset your handset. The data present on the added SD card will not be wiped out but you would lose your personal data or information or contacts stored on your phone memory.
4. You can find a method to hard reset your android phone here