1.By using Google account verification:
If you know your Google username and password, you can have your phone up and running again in no time. First, press the power button to bring up the lock screen. Then draw five incorrect patterns, which shouldn’t be too hard since you’ve already forgotten the correct one.
After the wrong fifth attempt, you should see a screen similar to the first one below. You now have 30 seconds before it will allow you to try again, but before your time is up, hit Forgot pattern? and it will ask you for your Google login information.Once you’ve entered it correctly, you’ll be asked to draw a new pattern for your lock screen. It’s as simple as that.
2.By using some lock pattern bypass Apps:
If you can’t remember your Google credentials, there are a few other ways you can get back into your phone. One is with a free app called Screen Lock Bypass, which lets you access all of your data so that you can back it up before resetting. You can also try the Pro version that resets the PIN or pattern so you don’t have to wipe your device.
Just download the app on your computer, install it onto your device via the Web Market and reboot your device. You should see a screen asking you to activate the app. You should know, however, that once you activate it, the app will run every time you reboot, so make sure to uninstall if you’re worried about it falling into the wrong hands.
3.By using windows command prompt:
This one requires you to have Android Debug Bridge (ADB) installed on your computer. ADB is part of the Android SDK, which you can download here. You’ll also need to have USB debugging enabled on your device, which can be found under Settings >> Applications >> Development.