Phone is locked, but can not enter the six-digit security code

Android products
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I was six-digit security PIN, but the phone display only 4 digits

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User-added image

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Hello Tam,

I certainly understand that your phone got locked and you got a six digit PIN but where as your device has only four digits to enter. In this case, I request you to contact our mobile team. Please click on the following  link http://bit.ly/1EC8H4H and fill out your details, select as "ANDROID" then the name of AVG Program that you installed in your mobile and in description explain bout your issue completely and finally click on Email option. Our AVG mobile team will reply back to you via email with a resolution. Thank you.