To many pattern attempts
When you have too many attempts fort he pattern lock and fail, it should prompt you to input your gmail account and password. If you don't get that prompt, then turn off the phone, while the phone is off, press and hold at the same time the volume up, home and power key until you get to see a display with some letters, this is the recovery option. From here you are going to do a hard reset by scrolling down with the volume rocker to "wipe/format data", once highlighted press the power button to complete, scroll down to "wipe cache" and do the same thing, and last, scroll up to "reboot" and press power button to reboot device. You device should be as brand new and without any pattern lock.
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