Today, I had the same if not similar problem, so I contacted the carrier. They directed me to a blog geekbuying.com/index.php/2013/12/03/how-to-erase-your-lock-screen-password-or pattern.on your android-device/#.Up20100bju4. Although there are several methods to unlocking a lock phone, as I was trying method 2, where ADB command to help you erase the password, if you still don't know what is ADB, and how to use it, here is the instructions: http//www.howtogeek.com/125769/
If you understand the ADB very well, then, the command is here: adb shell rm /data/system/gesture.key
this is for erasing the password;
adb shell rm /data/system/password.key
this is for erasing the pattern.
both methods are all based you have open the USB Debug. How about you forget to open that? If you don't open the USB debug and there is only two ways to erase the password:
1- flash the firmware again for you device; (because different phone has different firmware update instructions just google the information you need)
2- wipe the data and cache. (instruction is here http://smallbusiness.chron.com/wipe-data-cache-android-316
As I began downloaded some of the requested files I stumbled across unlock your android device without USB Debug on, or a google account and still retain your files, using emergency calls or sim swap. I decided to utilized this one as I was not sure if my DeBug was on or off and to my surprise it worked.
Method 1 - The Screen lock bypass
Will work on all android devices running android 2.3 x or below no matter whether rooted or not.
How to use: Extract the gingerbread lock bypass file anywhere on your PC, install drivers for your phone using pdanet. Connect your device to the pc using USB cable, go to the extracted folder, run the Double_Click_Me.bat file and enter 1 to continue in the command window. Try unlocking your device now. The screen lock will be bypassed.
Method 2 - This will work on all android devices 4.0
How to use - Install drivers for your phone, you can search online using your phone model, connect your device to the pc using USB cable, go to the extracted folder. Run the Double_Click_Me.bat file and enter 1 to continue in the command window. Try unlocking your device now. Any password/pin/gestures that had been currently stopping you from having access to you device have been cleared.
I most definitely cannot take the credit as I don't know all of the websites I was on, but I made copies to follow the instructions and on the last two that seem to have worked for me and I hope it works for you their is a man name Andrew Miracle, android download and on top it had Tecmie Info Center. I am giving you word for word as I use their quotes because it differently worked for me.
My passion is to help people and as I stumbled across this website fixya and I hope I have been successful with the help of others to help others.